CVE-2021-29964
A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.79%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- EPSS
- 0.79% probability · 54th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1706501Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-24/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-26/Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1706501Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-24/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-26/Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.