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Maven
Not in CISA KEV
LOW severity

GHSA-vwqq-5vrc-xw9h

LOW

GHSA-vwqq-5vrc-xw9h is a low-severity (CVSS 3.7) CWE-295 vulnerability in org.apache.logging.log4j:log4j. O3 Security confirms whether GHSA-vwqq-5vrc-xw9h is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender

Also known asCVE-2020-9488
Published
Jun 5, 2020
Updated
Jun 9, 2026
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Jun 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

6 pkgs affected
org.apache.logging.log4j:log4jorg.apache.logging.log4j:log4j-coreorg.apache.logging.log4j:log4jorg.apache.logging.log4j:log4jorg.apache.logging.log4j:log4j-coreorg.apache.logging.log4j:log4j-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender prior to version 2.13.2. This could allow an SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent through that appender.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
Mavenorg.apache.logging.log4j:log4j2.13.0&&< 2.13.22.13.2
Mavenorg.apache.logging.log4j:log4j-core2.13.0&&< 2.13.22.13.2
Mavenorg.apache.logging.log4j:log4j2.4.0&&< 2.12.32.12.3
Mavenorg.apache.logging.log4j:log4jall versions2.3.2
Mavenorg.apache.logging.log4j:log4j-core2.4.0&&< 2.12.32.12.3
Mavenorg.apache.logging.log4j:log4j-coreall versions2.3.2

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.logging.log4j:log4j. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update org.apache.logging.log4j:log4j to 2.13.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vwqq-5vrc-xw9h is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-vwqq-5vrc-xw9h is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-vwqq-5vrc-xw9h. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender prior to version 2.13.2. This could allow an SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent through that appender.
O3 Security · Impact-Aware SCA

Is GHSA-vwqq-5vrc-xw9h in your dependencies?

O3 detects GHSA-vwqq-5vrc-xw9h across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-vwqq-5vrc-xw9h: log4j (Low 3.7) | O3 Security