Firefox Memory Safety Issues

Remote code execution in Mozilla Firefox versions prior to 149.0.2 stems from multiple memory safety bugs allowing unauthenticated network attackers to execute arbitrary code without user interaction. Mozilla confirmed memory corruption evidence across affected versions (Firefox 149.0.1 and Thunderbird 149.0.1), though Thunderbird patch status remains unconfirmed. CVSS 9.8 reflects maximum severity due to network-accessible attack vector with no complexity barriers. No public exploit identified at time of analysis, though the CWE-787 out-of-bounds write class has high weaponization potential once technical details emerge from linked Bugzilla entries.

Remote code execution in Mozilla Firefox and Thunderbird via memory corruption vulnerabilities allows unauthenticated remote attackers to execute arbitrary code without user interaction. Affects Firefox <149.0.2, Firefox ESR <115.34.1, and Firefox ESR <140.9.1 across desktop platforms. With CVSS 9.8 (critical severity, network-accessible, no privileges required) and CWE-119 buffer overflow classification, this represents multiple memory safety bugs that Mozilla assessed could be exploited for arbitrary code execution. No public exploit identified at time of analysis; EPSS data not provided but critical browser vulnerabilities historically attract rapid exploitation interest.

Multiple memory corruption vulnerabilities in Mozilla Firefox (< 149.0.2) and Firefox ESR (< 140.9.1) enable unauthenticated remote code execution with critical CVSS 9.8 severity. These memory safety bugs-including CWE-787 out-of-bounds write issues-affect both standard and Extended Support Release channels, with Mozilla confirming evidence of memory corruption exploitable for arbitrary code execution. No active exploitation confirmed (not in CISA KEV) and no public exploit identified at time of analysis, though CVSS vector indicates network-accessible attack requiring no user interaction.