Firefox 140.5.0 ESR - Slackware Patches Multiple CVEs Quickly
Category:Vulnerabilities & Exploits
Slackware released Firefox 140.5.0 ESR update patching nine CVEs discovered by Mozilla: CVE-2025-13012, CVE-2025-13016, CVE-2025-13017, CVE-2025-13018, CVE-2025-13019, CVE-2025-13013, CVE-2025-13020, CVE-2025-13014, and CVE-2025-13015. Mozilla's security advisory MFSA2025-88 bundles memory safety bugs, use-after-free vulnerabilities, and type confusion issues affecting Firefox ESR branch. The CVE cluster indicates coordinated fixes rather than disparate discoveries—likely from Mozilla's internal security audit or coordinated disclosure program. Slackware 15.0 and -current branches both received the update, with packages available for i686 and x86_64 architectures. The patches address browser exploitation vectors that could lead to code execution or information disclosure.
CORTEX Protocol Intelligence Assessment
Business Impact: The bundling of nine CVEs into single ESR release suggests Mozilla prioritized these collectively rather than staggering releases. Memory safety and use-after-free bugs in browsers are consistently attractive targets since exploitation happens in user context with access to cookies, credentials, and browsing sessions. Type confusion issues are particularly interesting—they often stem from JavaScript engine JIT compilation where runtime type assumptions break down. Slackware's quick turnaround shows these patches were treated as high priority despite no public evidence of active exploitation.
Strategic Intelligence Guidance
- Push Firefox 140.5.0 ESR via configuration management to all Slackware endpoints.
- Audit browsers for outdated extensions; enforce allowlists and disable NPAPI-style plug-ins.
- Detect abnormal browser child processes indicative of exploitation.
- Harden profiles with enterprise policies and block risky enterprise roots.
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Intelligence Source: Firefox 140.5.0 ESR - Slackware Patches Multiple CVEs Quickly | Nov 12, 2025