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Full vulnerability report · 2020
CVE-2018-1285High confidence

This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files

Unknown · Apache log4net

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 17.37% 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 Unknown Apache log4net 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 3 daysRemediation target: Within 90 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.

3 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 · sourcelog4netVendor fix publishedDebian records a fixed source-package version for this release.1.2.10+dfsg-8Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcelog4netVendor fix publishedDebian records a fixed source-package version for this release.1.2.10+dfsg-8Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcelog4netVendor fix publishedDebian records a fixed source-package version for this release.1.2.10+dfsg-8Debian Security Tracker ↗Source updated 5 Oct 2026
Open-source package ranges1 source-attributed range

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
NuGetlog4netECOSYSTEM: introduced 0; fixed 2.0.102.0.10OSV record ↗aggregator derived · 12 Mar 2024
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-2021-0478

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 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.

What

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. 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 Restriction of XML External Entity Reference → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
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-611 ↗

CWE-611: Improper Restriction of XML External Entity Reference. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

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:N/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.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing 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
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.
NetworkUnauthenticatedCWE-611
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20200513Security Bulletin 13 May 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 13 May 2020, published on 13 May 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CISA · English · ICSA-26-239-04Applied Systems Engineering ASE2000 V2 Communications Test Set

ASE2000 versions 2.25 through 2.37 is vulnerable to Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE based attacks in applications that accept attacker controlled log4net configuration files.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-727Multiples vulnérabilités dans les produits Intel

ntel-sa-00703.html.html Bulletin de sécurité Intel intel-sa-00705.html du 09 août 2022 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00705.html.html Bulletin de sécurité Intel intel-sa-00706.html du 09 août 2022 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00706.html.html Bulletin de sécurité Intel intel-sa-00709.html du 09 août 2022 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00709.html.html Bulletin de sécurité Intel intel-sa-00712.html du 09 août 2022 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00712.html.html Référence CVE CVE-2018-1285 https://www.cve.org/CVERecord?id=CVE-2018-1285 Référence CVE CVE-2021-23168 https://www.cve.org/CVERecord?id=CVE-2021-23168 Référence CVE CVE-2021-23179 https://www.cve.org/CVERecord?id=CVE-2021-23179 Référence CVE CVE-2021-23188 https://www.cve.org/CVERecord?id=CVE-2021-23188 Référence CVE CVE-2021-23223 https://www.cve.org/CVERecord?id=CVE-2021-23223 Référence CVE CVE-2021-26254 https://www.cve.org/CVERecord?id=CVE-2021-26254 Référence CVE CVE-2021-26257 https://www.cve.org/CVERecord?id=CVE-2021-26257 Référence CVE CVE-2021-26950 https://www.cve.org/CVERecord?id=CVE-2021-26950 Référence CVE CVE-2021-33060 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-090Multiples vulnérabilités dans Foxit PDF Reader et Foxit PDF Editor

De multiples vulnérabilités ont été découvertes dans Foxit PDF Reader et Foxit PDF Editor. 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 l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-005296Apache log4net における XML 外部エンティティの脆弱性

Apache log4net には、XML 外部エンティティの脆弱性が存在します。

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
Apache log4net: Apache log4net up to 2.0.8
Fixed
All customers running ASE2000 versions 2.25 through 2.37 are affected by this issue and are required to upgrade to version 2.38 or later to apply the security fix. Upgrade instructions and user documentation are available at www.ase-systems.com. For detailed, step-by-step guidance on upgrading to the latest version and patching the impacted components, please contact our support team at support@ase-systems.com.
Action
Apply the fixed release for the affected product branch as recorded by CISA. Validate the exact product and build in the linked advisory before deployment.
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 11 May 2020 · Last source change 5 Aug 2024, 03:59 UTC · CWE-611 · Improper Restriction of XML External Entity Reference

CVE recordCVE.org · 5.1
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-2021-0478
Product sourceCNA
Remediation sourceCVE/CNA references
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. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache log4net up to 2.0.8 · 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 log4net up to 2.0.8 · Fixed: All customers running ASE2000 versions 2.25 through 2.37 are affected by this issue and are required to upgrade to version 2.38 or later to apply the security fix. Upgrade instructions and user documentation are available at www.ase-systems.com. For detailed, step-by-step guidance on upgrading to the latest version and patching the impacted components, please contact our support team at support@ase-systems.com.
    CISA ↗
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-2021-0478↗CISA remediation guidance↗Vendor advisory↗Vendor advisory↗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-2018-1285 · cve.blacktree.nl