What is CVE-2020-2099?

CVE-2020-2099 is a high-severity vulnerability in Jenkins, classified under Use of Insufficiently Random Values. CVSS score: 8.6/10. Published 2020-01-29.

How severe is CVE-2020-2099?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Jenkins

CVE-2020-2099

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.

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

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.010 (61.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

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-2020-2099?: CVE-2020-2099 is a high-severity vulnerability in Jenkins, classified under Use of Insufficiently Random Values. CVSS score: 8.6/10. Published 2020-01-29.
How severe is CVE-2020-2099?: High severity. CVSS v3 base score is 8.6 out of 10.