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CVE-2021-43535

Date: December 8, 2021

A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.

Severity Score

Related Resources (13)

https://www.mozilla.org/security/advisories/mfsa2021-50/
https://nvd.nist.gov/vuln/detail/CVE-2021-43535
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-43535
https://www.debian.org/security/2021/dsa-5026
https://bugzilla.mozilla.org/show_bug.cgi?id=1667102
https://security-tracker.debian.org/tracker/CVE-2021-43535
https://www.mozilla.org/security/advisories/mfsa2021-49/
https://www.mozilla.org/security/advisories/mfsa2021-43/
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
https://www.debian.org/security/2022/dsa-5034
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
https://access.redhat.com/security/cve/CVE-2021-43535
https://www.mend.io/vulnerability-database/CVE-2021-43535

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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