CVE-2020-2099 Inbound TCP Agent Protocol/3 authentication bypass in Jenkins

What is CVE-2020-2099?

CVE-2020-2099 is a high-severity vulnerability in Jenkins Jenkins, published on 29 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-330

Which versions are affected by CVE-2020-2099?

5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.

Products include Jenkins Jenkins.

How do I fix CVE-2020-2099?

Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.204.2 or 2.214.

Is CVE-2020-2099 being exploited?

There is no known exploitation of CVE-2020-2099 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Jenkins

• CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Exploited Critical 9.8
• CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2017-1000353 Jenkins Remote Code Execution Exploited Critical 9.8
• CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Exploited High 7.5
• CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins Critical 9.8

All Jenkins Jenkins vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-jenkins-2020-2099, GHSA-qp4f-2w67-c8hw.