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Full vulnerability report · 2024
CVE-2024-38473High confidence

Apache HTTP Server proxy encoding problem

Apache Software Foundation · Apache HTTP Server

8.1HighCVSS 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:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 25.88% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Apache Software Foundation Apache HTTP Server 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: Within 30 daysRemediation target: Within 180 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

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

8 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
Alpine v3.23v3.23 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.60-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.60-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.60-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.60-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.61-1~deb12u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.60-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.60-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveapache2Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.2.4.58-1ubuntu8.2Canonical Ubuntu Security ↗Source updated 5 Oct 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.

1 current
CVE-2024-38473 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhttpd: Encoding problem in mod_proxy
9 known affected

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

  • httpd as a component of Red Hat Enterprise Linux 7
  • httpd-devel as a component of Red Hat Enterprise Linux 7
  • httpd-manual as a component of Red Hat Enterprise Linux 7
  • httpd-tools as a component of Red Hat Enterprise Linux 7
  • httpd.src as a component of Red Hat Enterprise Linux 7
  • mod_ldap as a component of Red Hat Enterprise Linux 7
  • mod_proxy_html as a component of Red Hat Enterprise Linux 7
  • mod_session as a component of Red Hat Enterprise Linux 7
  • mod_ssl as a component of Red Hat Enterprise Linux 7
Summary
A flaw was found in the mod_proxy module of httpd. Due to an encoding problem, specially crafted request URLs with incorrect encoding can be sent to backend services, potentially bypassing authentication.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, 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-2024-37354

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
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

Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

What

Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

Why

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

Why

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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
a network path → Improper Encoding or Escaping of Output → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
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-116 ↗

CWE-116: Improper Encoding or Escaping of Output. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

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

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

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-116
A

Official authority intelligence

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

BSI · German · WID-SEC-2024-1913Red Hat OpenShift Container Platform: Mehrere Schwachstellen

Ein entfernter anonymer oder lokaler Angreifer kann mehrere Schwachstellen in Red Hat OpenShift Container Platform ausnutzen, um seine Privilegien zu erhöhen, beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, vertrauliche Informationen offenzulegen, Dateien und Daten zu manipulieren oder Sicherheitsmaßnahmen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2024-1504Apache HTTP Server: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand herbeizuführen, Sicherheitsmaßnahmen zu umgehen oder vertrauliche Informationen offenzulegen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240703Security Bulletin 03 Jul 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 03 Jul 2024, published on 3 July 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0750Multiples vulnérabilités dans les produits IBM

d?id=CVE-2022-41678 Référence CVE CVE-2024-34069 https://www.cve.org/CVERecord?id=CVE-2024-34069 Référence CVE CVE-2024-35153 https://www.cve.org/CVERecord?id=CVE-2024-35153 Référence CVE CVE-2024-35154 https://www.cve.org/CVERecord?id=CVE-2024-35154 Référence CVE CVE-2024-35195 https://www.cve.org/CVERecord?id=CVE-2024-35195 Référence CVE CVE-2024-37532 https://www.cve.org/CVERecord?id=CVE-2024-37532 Référence CVE CVE-2024-37890 https://www.cve.org/CVERecord?id=CVE-2024-37890 Référence CVE CVE-2024-37891 https://www.cve.org/CVERecord?id=CVE-2024-37891 Référence CVE CVE-2024-38472 https://www.cve.org/CVERecord?id=CVE-2024-38472 Référence CVE CVE-2024-38473 https://www.cve.org/CVERecord?id=CVE-2024-38473 Référence CVE CVE-2024-38474 https://www.cve.org/CVERecord?id=CVE-2024-38474 Référence CVE CVE-2024-38475 https://www.cve.org/CVERecord?id=CVE-2024-38475 Référence CVE CVE-2024-38476 https://www.cve.org/CVERecord?id=CVE-2024-38476 Référence CVE CVE-2024-38477 https://www.cve.org/CVERecord?id=CVE-2024-38477 Référence CVE CVE-2024-39338 https://www.cve.org/CVERecord?id=CVE-2024-39338 Référence CVE CVE-2024-39573 https://www.cve.org/CVERecord?id=CVE-2024-39573 Référence CVE CVE-2024-39689 https://www.cve.org/CVERecord?id=CVE-2024-39689 Référence CVE CVE-2024-39705 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0676Multiples vulnérabilités dans Tenable Security Center

De multiples vulnérabilités ont été découvertes dans Tenable Security Center. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0533Multiples vulnérabilités dans Apache HTTP Server

De multiples vulnérabilités ont été découvertes dans Apache HTTP Server. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2024-025592Apache Software Foundation の Apache HTTP Server 等複数ベンダの製品におけるエンコードおよびエスケープに関する脆弱性

Apache Software Foundation の Apache HTTP Server 等複数ベンダの製品には、エンコードおよびエスケープに関する脆弱性が存在します。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-007525エンタープライズサーバEP8000ハードウェア マネジメント コンソール(HWMC)製品における脆弱性(CVE-2025-49796他)について

ハードウェア マネジメント コンソール(HWMC)およびHRL3(*1)のHWMCコード(*2)に関するセキュリティ問題を修正しました。 対象製品、および詳細は、次項に記載の対象製品、およびCVEを参照してください。 *1HRL(HA Reset feature for LPAR)：系切替機構を搭載した専用HWMC *2HWMCコード：HWMC装置を制御するための専用プログラム

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-003907JP1製品における複数の脆弱性

JP1製品に下記の脆弱性が存在します。 CVE-2024-38473，CVE-2024-38477

Official advisory ↗
NCSC-NL · Dutch · NCSC-2024-0275Kwetsbaarheden verholpen in Apache HHTP-server

Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service te veroorzaken, middels een Server-Side-Request-Forgery (SSRF) verkeer te manipuleren, of om code uit te voeren binnen de webserver, waarvoor de kwaadwillende aanvankelijk niet is geautoriseerd.

Official advisory ↗
NCSC-NL · Dutch · NCSC-2025-0027Kwetsbaarheden verholpen in Oracle Fusion Middleware

De kwetsbaarheden bevinden zich in verschillende Oracle producten, waaronder Oracle WebLogic Server versies 12.2.1.4.0 en 14.1.1.0.0, die het mogelijk maken voor ongeauthenticeerde kwaadwillenden om toegang te krijgen tot kritieke gegevens. Dit kan leiden tot ernstige gevolgen voor de vertrouwelijkheid, integriteit en beschikbaarheid van de systemen. De kwetsbaarheid in Oracle HTTP Server versie 12.2.1.4.0 stelt kwaadwillenden in staat om ongeautoriseerde toegang te verkrijgen, met een CVSS-score van 5.3, terwijl de kwetsbaarheid in WebLogic Server een CVSS-score van 9.8 heeft, wat wijst op een kritieke impact. Kwaadwillenden kunnen ook gebruik maken van kwetsbaarheden in Oracle Fusion Middleware en andere producten om Denial-of-Service (DoS) aanvallen uit te voeren.

Official advisory ↗
NCSC-NL · Dutch · NCSC-2024-0411Kwetsbaarheden verholpen in Oracle Database producten

Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de volgende categorieën schade: - Denial-of-Service (DoS) - Manipuleren van data - Toegang tot gevoelige gegevens

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
Action
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 1 Jul 2024 · Last source change 13 Feb 2025, 17:53 UTC · CWE-116 · Improper Encoding or Escaping of Output

CVE recordCVE.org · 5.1
CVSS sourceCISA ADP
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-2024-37354
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    2.4.0 ≤ 2.4.59 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    2.4.0 ≤ 2.4.59 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2024-37354↗Red Hat Product Security security advisory↗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-2024-38473 · cve.blacktree.nl