CVE-2021-43535 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free11 documents8 sources
Severity
8.8HIGHNVD
EPSS
1.2%
top 21.12%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+1 more
Timeline
PublishedDec 8
Latest updateJan 21

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages8 packages

▶CVEListV5mozilla/firefoxunspecified — 93
▶NVDmozilla/firefox< 93.0
▶CVEListV5mozilla/firefox_esrunspecified — 91.3
▶NVDmozilla/firefox_esr< 91.3.0
▶CVEListV5mozilla/thunderbirdunspecified — 91.3

Also affects: Debian Linux 10.0, 11.0, 9.0

🔴Vulnerability Details

4
OSV
thunderbird vulnerabilities↗2022-01-21
▶
GHSA
GHSA-9c2c-v6c7-rjgv: 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 ex↗2021-12-09
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CVEList
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 ex↗2021-12-08
▶
OSV
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 ex↗2021-12-08
▶

📋Vendor Advisories

6
Ubuntu
Thunderbird vulnerabilities↗2022-01-21
▶
Red Hat
Mozilla: Use-after-free in HTTP2 Session object↗2021-11-02
▶
Debian
CVE-2021-43535: firefox - A use-after-free could have occured when an HTTP2 session object was released on...↗2021
▶
Mozilla
Mozilla Foundation Security Advisory 2021-50: CVE-2021-43535↗
▶
Mozilla
Mozilla Foundation Security Advisory 2021-49: CVE-2021-43535↗
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CVE-2021-43535 — Use After Free in Mozilla Firefox | cvebase