CVE-2015-2731

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 CSPService::ShouldLoad function in the microtask implementation in Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 allows remote attackers to execute arbitrary code by leveraging client-side JavaScript that triggers removal of a DOM object on the basis of a Content Policy.

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.

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Application impact

Vendor	Product	Versions
mozilla	firefox	`{"endIncluding":"38.1.0"}`
mozilla	thunderbird	`{"endIncluding":"38.0.1"}`
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.