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CVE-2021-29976

Date: August 5, 2021

Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 < 78.12, Firefox ESR < 78.12, and Firefox < 90.

Severity Score

Related Resources (12)

https://security.gentoo.org/glsa/202208-14
https://nvd.nist.gov/vuln/detail/CVE-2021-29976
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1700895%2C1703334%2C1706910%2C1711576%2C1714391
https://www.mozilla.org/security/advisories/mfsa2021-30/
https://www.mozilla.org/security/advisories/mfsa2021-29/
https://security.alpinelinux.org/vuln/CVE-2021-29976
https://security-tracker.debian.org/tracker/CVE-2021-29976
https://security.gentoo.org/glsa/202202-03
https://www.mozilla.org/security/advisories/mfsa2021-28/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29976
https://access.redhat.com/security/cve/CVE-2021-29976
https://www.mend.io/vulnerability-database/CVE-2021-29976

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

CVSS v3.1

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

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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