CVE-2021-3345

critical

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

9.5

Description

_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value. It is recommended to upgrade to 1.9.1 or later.

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-2021-3345

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202101-45

OS impact

OS	Version	Status	Fixed in
arch		fixed	`1.9.1-1`
debian	bookworm	fixed	`0`
debian	bullseye	fixed	`0`
debian	forky	fixed	`0`
debian	sid	fixed	`0`
debian	trixie	fixed	`0`

References

https://security.archlinux.org/ASA-202101-45
https://security-tracker.debian.org/tracker/CVE-2021-3345

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