CVE-2021-21606

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-13 · updated 2026-06-17
Weakness: CWE-20

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier improperly validates the format of a provided fingerprint ID when checking for its existence allowing an attacker to check for the existence of XML files with a short path.

Affected products

Jenkins: through 2.263.1; through 2.274

References

https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023

Get alerted when CVE-2021-21606 or the next vulnerability affects your stack