CVE-2026-6775 | Mozilla Firefox up to 149 WebRTC memory corruption

VDB-358472 · CVE-2026-6775 · GCVE-0-2026-6775 MOZILLA FIREFOX UP TO 149 WEBRTC MEMORY CORRUPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $5k-$25k 1.74+ Summaryinfo A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 149. This issue affects some unknown processing of the component WebRTC. Such manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2026-6775. The attack can be launched remotely. No exploit exists. You should upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, has been found in Mozilla Firefox up to 149. Affected by this issue is some unknown functionality of the component WebRTC. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes: Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150. The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is handled as CVE-2026-6775 since 04/21/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 04/21/2026). Upgrading to version 150 eliminates this vulnerability. Productinfo Type Web Browser Vendor Mozilla Name Firefox Version 149 License open-source Website Vendor: https://www.mozilla.org/ Product: https://www.mozilla.org/en-US/firefox/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Memory corruption CWE: CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Firefox 150 Timelineinfo 04/21/2026 Advisory disclosed 04/21/2026 +0 days CVE reserved 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Vendor: mozilla.org Product: mozilla.org Advisory: bugzilla.mozilla.org Status: Confirmed CVE: CVE-2026-6775 (🔒) GCVE (CVE): GCVE-0-2026-6775 GCVE (VulDB): GCVE-100-358472 Entryinfo Created: 04/21/2026 16:04 Changes: 04/21/2026 16:04 (56) Complete: 🔍 Cache ID: 99:06E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸