VulnerabilityModified
CVE-2021-38498
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash.
HIGH 7.5EPSS 1.47%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.47% probability · 72th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729642Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729642Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.