CVE-2015-2733

critical

Published 2015-07-06 · Modified 2026-05-06

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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

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a dedicated worker.

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.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
12.0	Affected	—

Application impact

Vendor	Product	Versions
mozilla	firefox	`{"endIncluding":"38.1.0"}`
mozilla	firefox	`31.0`
mozilla	firefox	`31.1.0`
mozilla	firefox	`31.1.1`
mozilla	firefox	`31.3.0`
mozilla	firefox	`31.5.1`
mozilla	firefox	`31.5.2`
mozilla	firefox	`31.5.3`
mozilla	firefox	`38.0`
mozilla	firefox_esr	`31.1`
mozilla	firefox_esr	`31.2`
mozilla	firefox_esr	`31.3`
mozilla	firefox_esr	`31.4`
mozilla	firefox_esr	`31.5`
mozilla	firefox_esr	`31.6.0`
mozilla	firefox_esr	`31.7.0`

References

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

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