CVE-2021-38500
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Mozilla developers 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. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 1.27% probability · 68th percentile
- CISA KEV
- Not listed
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird · debian/debian linux
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321Broken Link, Issue Tracking
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-44/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-46/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321Broken Link, Issue Tracking
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-44/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-46/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.