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Firefox CVE-2026-6752

| EUVDEUVD-2026-24093 HIGH
Buffer Overflow (CWE-119)
2026-04-21 mozilla GHSA-5wvf-8jjj-7w99
Mozilla Buffer Overflow
7.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:40 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 20:24 vuln.today
CVSS changed
Apr 21, 2026 - 20:22 NVD
7.3 (None) 7.3 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24093
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 7.3

DescriptionCVE.org

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

Remote code execution or information disclosure in Mozilla Firefox's WebRTC component allows network-based attackers to trigger memory corruption through incorrect boundary checks (CWE-119 buffer overflow class). All Firefox versions prior to 150, ESR versions prior to 115.35, and ESR versions prior to 140.10 are vulnerable. The CVSS vector indicates network-accessible exploitation with no authentication required (AV:N/PR:N), though CISA SSVC framework classifies exploitation as 'none' and automatable as 'no', suggesting limited real-world exploitation evidence at time of analysis. EPSS data not provided. Mozilla has released patches across all affected product lines.

Technical ContextAI

This vulnerability affects the WebRTC (Web Real-Time Communication) component in Firefox, which handles peer-to-peer audio, video, and data sharing in web browsers. The root cause is CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), commonly known as buffer overflow. WebRTC involves complex media stream processing and network protocol handling, making boundary validation critical. The CPE identifier cpe:2.3:a:mozilla:firefox confirms this affects the main Firefox browser application. Incorrect boundary conditions in buffer operations can lead to out-of-bounds reads or writes during WebRTC session establishment, media codec processing, or data channel communications. The vulnerability impacts confidentiality, integrity, and availability (C:L/I:L/A:L), indicating memory corruption that could be leveraged for various attack outcomes depending on exploitation technique.

RemediationAI

Upgrade immediately to Firefox 150 or later for rapid release channel users, or Firefox ESR 115.35/140.10 or later for ESR channel users. Download patches from Mozilla's official release channels or apply through organizational software deployment systems. Complete remediation guidance available in Mozilla security advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/ through mfsa2026-34/. If immediate patching is not possible, temporary risk reduction can be achieved by disabling WebRTC functionality through Firefox configuration (set media.peerconnection.enabled to false in about:config), though this breaks legitimate WebRTC applications including video conferencing platforms like Zoom, Google Meet, and Microsoft Teams browser clients. For enterprise environments unable to patch immediately, consider blocking WebRTC at network level using firewall rules to drop STUN/TURN traffic (UDP ports 3478, 5349), though this may interfere with legitimate business communications and has deployment complexity. Network-level controls provide incomplete protection as the vulnerability is in client-side parsing logic.

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Same weakness CWE-119 – Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6752 vulnerability details – vuln.today
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