Firefox CVE-2026-6747

| EUVD-2026-24088 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-wvr4-56pf-cc47
Information Disclosure Use After Free Memory Corruption Mozilla
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Updated
Apr 22, 2026 - 00:44 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 18:22 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
7.5 (HIGH)

DescriptionNVD

Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

High-severity denial-of-service in Firefox WebRTC component allows remote unauthenticated attackers to crash the browser via network-based use-after-free memory corruption. Affects Firefox versions prior to 150 and Firefox ESR prior to 140.10. …

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RemediationAI

Within 24 hours: Identify all Firefox installations across the organization and document current versions. Within 7 days: Deploy Firefox 150 (standard release) or Firefox ESR 140.10 (extended support release) to all endpoints using automated patch management; prioritize systems in high-availability environments. …

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CVE-2026-6747 vulnerability details – vuln.today
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