CVE-2021-34555

medium

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

5.5

Description

OpenDMARC 1.4.1 and 1.4.1.1 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a multi-value From header field.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-34555

OS impact

OS	Version	Status	Fixed in
arch		affected
debian	bookworm	fixed	`1.4.0~beta1+dfsg-6`
debian	bullseye	fixed	`1.4.0~beta1+dfsg-6`
debian	forky	fixed	`1.4.0~beta1+dfsg-6`
debian	sid	fixed	`1.4.0~beta1+dfsg-6`
debian	trixie	fixed	`1.4.0~beta1+dfsg-6`

References

https://security-tracker.debian.org/tracker/CVE-2021-34555

Verify integrity in audit chain (admin only). AS-IS.