Vulnerability Monitor

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CVE-2021-43535

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.

Published

2021-12-08T22:15:09.517

Last Modified

2024-11-21T06:29:22.570

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.8 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

6.4

Weaknesses

Type: Primary
CWE-416

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 93.0	Yes
Application	mozilla	firefox_esr	< 91.3.0	Yes
Application	mozilla	thunderbird	< 91.3.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	debian	debian_linux	10.0	Yes
Operating System	debian	debian_linux	11.0	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1667102 Issue Tracking, Permissions Required, Vendor Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory ([email protected])
https://www.debian.org/security/2021/dsa-5026 Third Party Advisory ([email protected])
https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2021-43/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory ([email protected])
https://bugzilla.mozilla.org/show_bug.cgi?id=1667102 Issue Tracking, Permissions Required, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2021/dsa-5026 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2021-43/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)