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CVE-2021-38496

Date: November 2, 2021

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

Severity Score

Related Resources (14)

https://nvd.nist.gov/vuln/detail/CVE-2021-38496
https://access.redhat.com/security/cve/CVE-2021-38496
https://www.mozilla.org/security/advisories/mfsa2021-47/
https://security.alpinelinux.org/vuln/CVE-2021-38496
https://www.mozilla.org/security/advisories/mfsa2021-44/
https://www.mozilla.org/security/advisories/mfsa2021-43/
https://www.mozilla.org/security/advisories/mfsa2021-46/
https://www.mozilla.org/security/advisories/mfsa2021-45/
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
https://security-tracker.debian.org/tracker/CVE-2021-38496
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-38496
https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
https://www.debian.org/security/2022/dsa-5034
https://www.mend.io/vulnerability-database/CVE-2021-38496

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

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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