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Full vulnerability report · 2020
CVE-2020-9484High confidence

Apache Tomcat: Deserialization of Untrusted Data

Unknown · Apache Tomcat

7.0HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Medium, lowered one band.downgradedsince 8 Oct 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 55.52% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Unknown Apache Tomcat and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.35-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian bookwormbookworm · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.35-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian forkyforky · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.35-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian sidsid · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.35-1Debian Security Tracker ↗Source updated 23 Oct 2026
Open-source package ranges16 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
Mavenorg.apache.tomcat.embed:tomcat-embed-coreECOSYSTEM: introduced 10.0.0-M1; fixed 10.0.0-M510.0.0-M5OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat.embed:tomcat-embed-coreECOSYSTEM: introduced 9.0.0; fixed 9.0.359.0.35OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat.embed:tomcat-embed-coreECOSYSTEM: introduced 8.0.0; fixed 8.5.558.5.55OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat.embed:tomcat-embed-coreECOSYSTEM: introduced 7.0.0; fixed 7.0.1047.0.104OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat:tomcat-catalinaECOSYSTEM: introduced 10.0.0-M1; fixed 10.0.0-M510.0.0-M5OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat:tomcat-catalinaECOSYSTEM: introduced 9.0.0; fixed 9.0.359.0.35OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat:tomcat-catalinaECOSYSTEM: introduced 8.0.0; fixed 8.5.558.5.55OSV record ↗aggregator derived · 26 Aug 2026
Mavenorg.apache.tomcat:tomcat-catalinaECOSYSTEM: introduced 7.0.0; fixed 7.0.1047.0.104OSV record ↗aggregator derived · 26 Aug 2026
mavenorg.apache.tomcat.embed:tomcat-embed-core>= 10.0.0-M1, <= 10.0.0-M410.0.0-M5GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat.embed:tomcat-embed-core>= 9.0.0, < 9.0.359.0.35GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat.embed:tomcat-embed-core>= 8.0.0, < 8.5.558.5.55GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat.embed:tomcat-embed-core>= 7.0.0, < 7.0.1047.0.104GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat:tomcat-catalina>= 10.0.0-M1, <= 10.0.0-M410.0.0-M5GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat:tomcat-catalina>= 9.0.0, < 9.0.359.0.35GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat:tomcat-catalina>= 8.0.0, < 8.5.558.5.55GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
mavenorg.apache.tomcat:tomcat-catalina>= 7.0.0, < 7.0.1047.0.104GitHub advisory ↗github reviewed aggregator · 25 Aug 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2020-9484 · CSAF 2.0 · revision 37 · interimSUSE Product Security TeamCVE-2020-9484
148 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • tomcat as component of HPE Helion OpenStack 8
  • tomcat-admin-webapps as component of HPE Helion OpenStack 8
  • tomcat-docs-webapp as component of HPE Helion OpenStack 8
  • tomcat-el-3_0-api as component of HPE Helion OpenStack 8
  • tomcat-javadoc as component of HPE Helion OpenStack 8
  • tomcat-jsp-2_3-api as component of HPE Helion OpenStack 8
  • tomcat-lib as component of HPE Helion OpenStack 8
  • tomcat-servlet-3_1-api as component of HPE Helion OpenStack 8
  • tomcat-webapps as component of HPE Helion OpenStack 8
  • tomcat as component of SUSE CaaS Platform 4.0
  • tomcat-admin-webapps as component of SUSE CaaS Platform 4.0
  • tomcat-el-3_0-api as component of SUSE CaaS Platform 4.0
Summary
When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2020-9484 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitytomcat: deserialization flaw in session persistence storage leading to RCE
5 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • pki-servlet-4.0-api (pki-deps:10.6) as a component of Red Hat Enterprise Linux 8
  • pki-servlet-engine.src (pki-deps:10.6) as a component of Red Hat Enterprise Linux 8
  • pki-servlet-engine (pki-deps:10.6) as a component of Red Hat Enterprise Linux 8
  • jbossweb as a component of Red Hat JBoss Data Virtualization 6
  • opendaylight.src as a component of Red Hat OpenStack Platform 10 (Newton)
Summary
A deserialization flaw was discovered in Apache Tomcat's use of a FileStore. Under specific circumstances, an attacker can use a specially crafted request to trigger Remote Code Execution through deserialization of the file under their control. The highest threat from the vulnerability is to data confidentiality and integrity as well as system availability.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-0404

No EUVD known-exploited evidence

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
0.0
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

What

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

What

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-502 ↗

CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
Remote code executionCWE-502
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2020-0404Official EUVD mapping

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

Official EUVD record ↗
BSI · German · WID-SEC-2022-0607Red Hat FUSE: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Red Hat FUSE ausnutzen, um vertrauliche Informationen offenzulegen, beliebigen Code auszuführen, einen Denial of Service Zustand herbeizuführen, Sicherheitsmaßnahmen zu umgehen, Daten und Informationen zu manipulieren und seine Privilegien zu erweitern.

Official advisory ↗
BSI · German · WID-SEC-2022-0432Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um die Vertraulichkeit, Verfügbarkeit und Integrität zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2022-0302Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um beliebigen Programmcode auszuführen, einen Cross-Site-Scripting-Angriff durchzuführen, Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2026-0205Oracle MySQL: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle MySQL ausnutzen, um die Verfügbarkeit, Vertraulichkeit und Integrität zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2022-1870Apache Tomcat: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit den Rechten des Dienstes

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Apache Tomcat ausnutzen, um beliebigen Programmcode mit den Rechten des Dienstes auszuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20200527Security Bulletin 27 May 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 27 May 2020, published on 27 May 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-082Multiples vulnérabilités dans Apache Tomcat

De multiples vulnérabilités ont été découvertes dans Apache Tomcat. Elles permettent à un attaquant de provoquer une élévation de privilèges et une exécution de code arbitraire.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-417Multiples vulnérabilités dans les produits Symantec

De multiples vulnérabilités ont été découvertes dans les produits Symantec. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-315Vulnérabilité dans Apache Tomcat

Une vulnérabilité a été découverte dans Apache Tomcat. Elle permet à un attaquant de provoquer une exécution de code arbitraire à distance.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2022-001131Apache Tomcat に Time-of-check Time-of-use (TOCTOU) 競合状態による権限昇格の脆弱性

The Apache Software Foundation から、Apache Tomcat の脆弱性に対するアップデートが公開されました。 　 　* Time-of-check Time-of-use (TOCTOU) 競合状態によるローカル権限昇格 - CVE-2022-23181 CVE-2020-9484 の修正時に作り込まれた、Time of check to time of use による競合状態の脆弱性を修正したアップデートです。 本脆弱性は、FileStore を利用し、セッションを永続化する構成にしている場合のみ影響を受けます。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-003862Apache Tomcat における脆弱性

Apache Tomcat には、不特定の脆弱性が存在します。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-004602Apache Tomcat に安全でないデシリアライゼーションの問題

The Apache Software Foundation から、Apache Tomcat の脆弱性に対するアップデートが公開されました。 * 信頼できないデータのデシリアライズ (CWE-502) - CVE-2020-9484

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5136Apache Tomcat 취약점 보안 업데이트 권고

Apache Tomcat에서 특정 조건*이 성립되는 경우, 공격자의 악성 요청 메시지가 역직렬화되어 발생하는 임의코드 실행 취약점(CVE-2020-9484) [1]

Official advisory ↗
NCSC-NL · Dutch · NCSC-2025-0123Kwetsbaarheden verholpen in Oracle Database Producten

De kwetsbaarheden stellen ongeauthenticeerde kwaadwillenden in staat om een Denial-of-Service te veroorzaken of om ongeautoriseerde toegang te verkrijgen tot gevoelige gegevens en gegevens te manipuleren. Subcomponenten als de RDBMS Listener, Java VM, en andere componenten zijn specifiek kwetsbaar, met CVSS-scores variërend van 5.3 tot 7.5, wat duidt op een gematigd tot hoog risico.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Action
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 20 May 2020 · Last source change 8 Oct 2026, 21:03 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2020-0404
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: oracle.com/cpujul2020.html; removed remediation: access.redhat.com/CVE-2020-9484.
    Before
    patch: lists.apache.org/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1@<announce.tomcat.apache.org> · patch: oracle.com/cpuApr2021.html · patch: oracle.com/cpujan2021.html · 6 more references
    After
    patch: lists.apache.org/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1@<announce.tomcat.apache.org> · patch: oracle.com/cpuApr2021.html · patch: oracle.com/cpujan2021.html · 6 more references
    oracle.com ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache Tomcat: Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    After
    Apache Tomcat: Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache Tomcat: Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Apache Tomcat: Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  5. Vendor guidanceAuthoritative vendor guidance changed: added remediation: oracle.com/cpujul2020.html; removed remediation: access.redhat.com/CVE-2020-9484.
    Before
    patch: lists.apache.org/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1@<announce.tomcat.apache.org> · patch: oracle.com/cpuApr2021.html · patch: oracle.com/cpujan2021.html · 6 more references
    After
    patch: lists.apache.org/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1@<announce.tomcat.apache.org> · patch: oracle.com/cpuApr2021.html · patch: oracle.com/cpujan2021.html · 6 more references
    oracle.com ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    After
    Apache Tomcat: Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2020-0404↗Vendor CSAF · SUSE Product Security Team↗Red Hat Product Security security advisory↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2020-9484 · cve.blacktree.nl