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CVE-2021-4129

Date: December 22, 2022

Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. 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 Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.

Severity Score

Related Resources (9)

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C1737009%2C1739372%2C1739421
https://www.mozilla.org/security/advisories/mfsa2021-53/
https://security-tracker.debian.org/tracker/CVE-2021-4129
https://www.mozilla.org/security/advisories/mfsa2021-52/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4129
https://access.redhat.com/security/cve/CVE-2021-4129
https://nvd.nist.gov/vuln/detail/CVE-2021-4129
https://www.mozilla.org/security/advisories/mfsa2021-54/
https://www.mend.io/vulnerability-database/CVE-2021-4129

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Insufficient Information

NVD-CWE-noinfo

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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