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Fencer Vulns
medium 4.8

CVE-2020-2252 json

Improper Validation of Certificate with Host Mismatch in Jenkins Mailer Plugin

published 2020-09-16 6 y ago modified 2026-06-17 4 mo ago also GHSA-6fr3-286q-q3cr , EUVD-2022-2778

cvss
4.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

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

Patch / fix

  • maven org.jenkins-ci.plugins:mailer 1.29.1, 1.31.1, 1.32.1
  • Jenkins project Jenkins Mailer Plugin 1.29.1, 1.31.1
  • runc openshift 4.6 1.0.0-81.rhaos4.6.git5b757d4.el7
  • runc openshift 4.6 1.0.0-81.rhaos4.6.git5b757d4.el8
  • podman openshift 4.6 1.9.3-3.rhaos4.6.el8
  • skopeo openshift 4.6 1:1.1.1-2.rhaos4.6.el8
  • podman-tests openshift 4.6 1.9.3-3.rhaos4.6.el8
  • skopeo-tests openshift 4.6 1:1.1.1-2.rhaos4.6.el8
  • podman-docker openshift 4.6 1.9.3-3.rhaos4.6.el8
  • podman-remote openshift 4.6 1.9.3-3.rhaos4.6.el8

red hat advisories RHSA-2020:4297RHSA-2020:5102

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-2252 updated cvss 4.8

jenkins-2-plugins/mailer: Missing hostname validation in Mailer Plugin could result in MITM

  • Red Hat OpenShift Container Platform 3.11 jenkins-2-plugins 3.11.1603460090-1.el7
    fixed: vendor fix RHSA-2020:5102
  • Red Hat OpenShift Container Platform 4.6 jenkins-2-plugins 4.6.1601368321-1.el8
    fixed: vendor fix RHSA-2020:4297
  • Red Hat OpenShift Container Platform 4.6 podman 1.9.3-3.rhaos4.6.el8, skopeo 1.1.1-2.rhaos4.6.el8, podman-tests 1.9.3-3.rhaos4.6.el8, skopeo-tests 1.1.1-2.rhaos4.6.el8, podman-docker 1.9.3-3.rhaos4.6.el8, podman-remote 1.9.3-3.rhaos4.6.el8, +7 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.jenkins-ci.plugins:mailer
>=1.32, <1.32.1
>=1.30, <1.31.1
<1.29.1
1.32.1
1.31.1
1.29.1

Affected products

  • Jenkins project Jenkins Mailer Plugin

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.