CVE-2021-43539

high

Description

Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

References

https://www.mozilla.org/security/advisories/mfsa2021-52/

https://bugzilla.mozilla.org/show_bug.cgi?id=1739683

https://www.mozilla.org/security/advisories/mfsa2021-54/

https://www.mozilla.org/security/advisories/mfsa2021-53/

https://www.debian.org/security/2021/dsa-5026

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://security.gentoo.org/glsa/202202-03

https://security.gentoo.org/glsa/202208-14

Details

Source: MITRE

Published: 2021-12-08

Updated: 2022-08-10

Type: CWE-416

Risk Information

CVSS v2

Base Score: 6.8

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

Impact Score: 6.4

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 2.8

Severity: HIGH