CVE-2016-5254

Original summary

Normalized public record · Updated Oct 23, 2026

Use-after-free vulnerability in the nsXULPopupManager::KeyDown function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows attackers to execute arbitrary code or cause a denial of service (heap memory corruption and application crash) by leveraging keyboard access to use the Alt key during selection of top-level menu items.

Publisher and source text is retained separately from QFinch interpretation.

Affected products

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

1. Confirm the affected product and reachable code path exist in your environment.
2. Apply the vendor-supported patch or mitigation from the primary advisory.
3. Rescan the exact deployed revision and retain verification evidence.

Evidence coverage

SSVC priority

MEDIUM

Confidence

20%

Aliases

None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

1. DSA-3640 ↗
2. 1036508 ↗
3. bugzilla.mozilla.org ↗
4. www.oracle.com ↗
5. www.mozilla.org ↗
6. USN-3044-1 ↗
7. RHSA-2016:1551 ↗
8. GLSA-201701-15 ↗
9. openSUSE-SU-2016:1964 ↗
10. 92261 ↗
11. openSUSE-SU-2016:2026 ↗

Record history

Published Aug 5, 2016 · Last refreshed Oct 23, 2026