Use After Free Affecting Firefox-ESR package, versions [,140.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-FIREFOXESR-13893793
- published12 Nov 2025
- disclosed11 Nov 2025
- creditAndreas Pehrson
Introduced: 11 Nov 2025
NewCVE-2025-13020 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 140.5 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via the WebRTC: Audio/Video component. An attacker can execute arbitrary code or cause a denial of service by triggering use of memory after it has been freed.