CVE-2021-38496 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free14 documents8 sources
Severity
8.8HIGHNVD
EPSS
1.1%
top 22.03%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+1 more
Timeline
PublishedNov 3
Latest updateMay 24

Description

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.

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/firefox91.0 — 91.2+1
▶CVEListV5mozilla/firefox_esrunspecified — 91.2+1
▶NVDmozilla/firefox_esr< 78.15
▶CVEListV5mozilla/thunderbirdunspecified — 78.15+1

Also affects: Debian Linux 10.0, 11.0, 9.0

🔴Vulnerability Details

4
GHSA
GHSA-3rfx-pjp7-cvfp: During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploit↗2022-05-24
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OSV
thunderbird vulnerabilities↗2022-01-21
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OSV
CVE-2021-38496: During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploit↗2021-11-03
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CVEList
CVE-2021-38496: During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploit↗2021-11-03
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📋Vendor Advisories

9
Ubuntu
Thunderbird vulnerabilities↗2022-01-21
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Ubuntu
Thunderbird vulnerabilities↗2021-11-03
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Ubuntu
Firefox vulnerabilities↗2021-10-07
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Red Hat
Mozilla: Use-after-free in MessageTask↗2021-10-05
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Debian
CVE-2021-38496: firefox - During operations on MessageTasks, a task may have been removed while it was sti...↗2021
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CVE-2021-38496 — Use After Free in Mozilla Firefox | cvebase