CVE-2021-40516

medium

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

5.5

Description

WeeChat before 3.2.1 allows remote attackers to cause a denial of service (crash) via a crafted WebSocket frame that trigger an out-of-bounds read in plugins/relay/relay-websocket.c in the Relay plugin.

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-2021-40516

OS impact

OS	Version	Status	Fixed in
arch		fixed	`3.2.1-1`
debian	bookworm	fixed	`3.2.1-1`
debian	bullseye	fixed	`3.0-1+deb11u1`
debian	forky	fixed	`3.2.1-1`
debian	sid	fixed	`3.2.1-1`
debian	trixie	fixed	`3.2.1-1`

References

https://security-tracker.debian.org/tracker/CVE-2021-40516

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