Mozilla Foundation Security Advisory 2021-44
Security Vulnerabilities fixed in Firefox ESR 78.15
- Announced
- October 5, 2021
- Impact
- high
- Products
- Firefox ESR
- Fixed in
-
- Firefox ESR 78.15
#CVE-2021-38496: Use-after-free in MessageTask
- Reporter
- Yangkang of 360 ATA Team
- Impact
- high
Description
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash.
References
#CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2
- Reporter
- Mozilla developers
- Impact
- high
Description
Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.