CVE-2021-21696

Description

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs, allowing attackers in control of agent processes to replace the code of a trusted library with a modified variant. This results in unsandboxed code execution in the Jenkins controller process.

9.8

CVSS

Severity: Critical

CVSS 3.1 •

CVSS 2.0 •

EPSS 1.06% Top 25%

Vendor Advisory jenkins.io

Affected: Jenkins project Jenkins

References

Link	Tags
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423	mitigation vendor advisory
http://www.openwall.com/lists/oss-security/2021/11/04/3	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-21696?: CVE-2021-21696 has been scored as a critical severity vulnerability.
How to fix CVE-2021-21696?: To fix CVE-2021-21696, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-21696 being actively exploited in the wild?: It is possible that CVE-2021-21696 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21696?: CVE-2021-21696 affects Jenkins project Jenkins.

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