What is CVE-2020-2102?

CVE-2020-2102 is a medium-severity vulnerability in Jenkins, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-01-29.

How severe is CVE-2020-2102?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Jenkins

CVE-2020-2102

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier used a non-constant time comparison function when validating an HMAC.

Published 2020-01-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

jenkins.io/security/advisory/2020-01-29/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2020/01/29/1 (mailing-list, Mailing List, Third Party Advisory)
access.redhat.com/errata/RHSA-2020:0681 (vendor-advisory)
access.redhat.com/errata/RHSA-2020:0683 (vendor-advisory)
access.redhat.com/errata/RHBA-2020:0402 (vendor-advisory)
access.redhat.com/errata/RHBA-2020:0675 (vendor-advisory)

Frequently asked questions

What is CVE-2020-2102?: CVE-2020-2102 is a medium-severity vulnerability in Jenkins, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-01-29.
How severe is CVE-2020-2102?: Medium severity. CVSS v3 base score is 5.3 out of 10.