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Maven
Not in CISA KEV
HIGH severity

CVE-2023-6481

HIGH

CVE-2023-6481 is a high-severity (CVSS 7.1) vulnerability in ch.qos.logback:logback-core. O3 Security confirms whether CVE-2023-6481 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Logback "receiver" DOS vulnerability CVE-2023-6378 incomplete fix

Also known asGHSA-gm62-rw4g-vrc4
Published
Dec 4, 2023
Updated
Jul 15, 2026
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Jul 15, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

3 pkgs affected
ch.qos.logback:logback-corech.qos.logback:logback-corech.qos.logback:logback-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

A serialization vulnerability in logback receiver component part of logback version 1.4.13, 1.3.13 and 1.2.12 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
Mavench.qos.logback:logback-core1.4.13&&< 1.4.141.4.14
Mavench.qos.logback:logback-core1.3.13&&< 1.3.141.3.14
Mavench.qos.logback:logback-core1.2.12&&< 1.2.131.2.13

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ch.qos.logback:logback-core. 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 ch.qos.logback:logback-core to 1.4.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-6481 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 CVE-2023-6481 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 CVE-2023-6481. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

A serialization vulnerability in logback receiver component part of logback version 1.4.13, 1.3.13 and 1.2.12 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.
O3 Security · Impact-Aware SCA

Is CVE-2023-6481 in your dependencies?

O3 detects CVE-2023-6481 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

CVE-2023-6481: logback-core (High 7.1) | O3 Security