CVE-2021-21615 Time-of-check Time-of-use (TOCTOU) Race Condition in Jenkins

What is CVE-2021-21615?

CVE-2021-21615 is a medium-severity vulnerability in Jenkins Jenkins, published on 26 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

Weakness: CWE-367

Which versions are affected by CVE-2021-21615?

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-2021-21615?

Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.263.3 or 2.276.

Is CVE-2021-21615 being exploited?

There is no known exploitation of CVE-2021-21615 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-2021-21615, GHSA-qxp6-27gw-99cj.