CVE-2023-6204

high

Published 2023-11-27 · Modified 2023-11-27

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

AlmaLinux Fixed 1 release

Version	Status	Fixed in
9	Fixed	`thunderbird-115.5.0-1.el9_3.alma.ppc64le.rpm`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`115.5.0esr-1`
sid	Fixed	`120.0-1`
forky	Fixed	`115.5.0esr-1`
bullseye	Fixed	`115.5.0esr-1~deb11u1`
bookworm	Fixed	`115.5.0esr-1~deb12u1`

Red Hat Fixed 2 releases

Version	Status	Fixed in
9	Fixed	—
8	Fixed	—

Rocky Linux Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

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