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Fencer Vulns
medium 5.3

CVE-2020-12272 json

OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about the domain that orig…

published 2020-04-27 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4585

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about the domain that originated an e-mail message. This is caused by incorrect parsing and interpretation of SPF/DKIM authentication results, as demonstrated by the example.net(.example.com substring.

Patch / fix

  • opendmarc Debian 14, Debian 13, Debian 12 1.4.0~beta1+dfsg-4

debian advisories DEBIAN-CVE-2020-12272

  • opendmarc Ubuntu 18.04 LTS 1.3.2-3ubuntu0.2
  • opendmarc Ubuntu 20.04 LTS 1.3.2-7ubuntu0.1
  • opendmarc Ubuntu Pro 16.04 LTS 1.3.1+dfsg-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-12272

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opendmarc Arch Linux 1.4.1.1-1

arch linux advisories AVG-1375

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-2020-12272 updated

opendmarc: Two vulnerabilities in openDMARC 1.3.2

  • Red Hat All currently supported Red Hat products
    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

2.12% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • sourceforge.net https://sourceforge.net/p/opendmarc/tickets/237/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

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.