What is CVE-2020-2252?

CVE-2020-2252 is a medium-severity vulnerability in Jenkins Mailer, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2020-09-16.

How severe is CVE-2020-2252?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Jenkins Mailer

CVE-2020-2252

Jenkins Mailer Plugin 1.32 and earlier does not perform hostname validation when connecting to the configured SMTP server.

Vulnerability class: Improper Certificate Validation

Published 2020-09-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.1% 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 Mailer
Jenkins Project Mailer Plugin — versions unspecified, 1.29.1, 1.31.1

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

www.jenkins.io/security/advisory/2020-09-16/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2020/09/16/3 (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2020-2252?: CVE-2020-2252 is a medium-severity vulnerability in Jenkins Mailer, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2020-09-16.
How severe is CVE-2020-2252?: Medium severity. CVSS v3 base score is 4.8 out of 10.