CVE-2021-23978 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds WriteCWE-120 — Classic Buffer Overflow12 documents8 sources
Severity
8.8HIGHNVD
OSV4.3
EPSS
1.2%
top 20.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+1 more
Timeline
PublishedFeb 26
Latest updateMay 24

Description

Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

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/firefox< 86
▶NVDmozilla/firefox< 86.0
▶CVEListV5mozilla/firefox_esr< 78.8
▶CVEListV5mozilla/thunderbird< 78.8

Also affects: Debian Linux 10.0, 9.0

🔴Vulnerability Details

4
GHSA
GHSA-3rjx-v36w-2rw5: Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-05-06
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CVEList
CVE-2021-23978: Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78↗2021-02-26
▶
OSV
CVE-2021-23978: Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78↗2021-02-26
▶

📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2021-05-06
▶
Ubuntu
Firefox vulnerabilities↗2021-02-26
▶
Red Hat
Mozilla: Memory safety bugs fixed in Firefox 86 and Firefox ESR 78.8↗2021-02-23
▶
Debian
CVE-2021-23978: firefox - Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox...↗2021
▶
Mozilla
Mozilla Foundation Security Advisory 2021-09: CVE-2021-23978↗
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CVE-2021-23978 — Out-of-bounds Write in Mozilla Firefox | cvebase