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CVE-2021-23964

Date: February 26, 2021

Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Severity Score

Related Resources (10)

https://www.mozilla.org/security/advisories/mfsa2021-04/
https://nvd.nist.gov/vuln/detail/CVE-2021-23964
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925
https://www.mozilla.org/security/advisories/mfsa2021-03/
https://security-tracker.debian.org/tracker/CVE-2021-23964
https://www.mozilla.org/security/advisories/mfsa2021-05/
https://security.alpinelinux.org/vuln/CVE-2021-23964
https://access.redhat.com/security/cve/CVE-2021-23964
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23964
https://www.mend.io/vulnerability-database/CVE-2021-23964

Severity Score

Weakness Type (CWE)

Buffer Errors

CWE-119

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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