CVE-2017-5447

critical

Published — · Modified —

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

10.0

Description

An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Predictions

Exploit likelihood

20%

Patch ETA

—

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.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-42071 dos multiple verified

Google Security Research · 2017-05-25

Mozilla Firefox < 53 - 'gfxTextRun' Out-of-Bounds Read

Source code queued for fetch — refresh in a moment.

OS impact

OS	Version	Status	Fixed in
arch		fixed	`53.0-1`
sles		affected
debian	sid	fixed	`52.0.1-1`
debian	bookworm	fixed	`45.9.0esr-1`
debian	bullseye	fixed	`45.9.0esr-1`
debian	forky	fixed	`45.9.0esr-1`
debian	trixie	fixed	`45.9.0esr-1`

References

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

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