CVE-2021-23979 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds WriteCWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer6 documents6 sources
Severity
8.8HIGHNVD
EPSS
0.3%
top 43.34%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxDebian Firefox
Timeline
PublishedFeb 26
Latest updateMay 24

Description

Mozilla developers reported memory safety bugs present in Firefox 85. 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.

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 Packages5 packages

▶CVEListV5mozilla/firefox< 86
▶NVDmozilla/firefox< 86.0
▶Ubuntumozilla/firefox< 86.0+build3-0ubuntu0.16.04.1+2
▶mozillamozilla/firefox
▶debiandebian/firefox< firefox 86.0-1 (sid)

🔴Vulnerability Details

2
GHSA
GHSA-h2wp-qp38-rjj4: Mozilla developers reported memory safety bugs present in Firefox 85↗2022-05-24
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OSV
CVE-2021-23979: Mozilla developers reported memory safety bugs present in Firefox 85↗2021-02-26
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📋Vendor Advisories

3
Ubuntu
Firefox vulnerabilities↗2021-02-26
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Debian
CVE-2021-23979: firefox - Mozilla developers reported memory safety bugs present in Firefox 85. Some of th...↗2021
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Mozilla
Mozilla Foundation Security Advisory 2021-07: CVE-2021-23979↗
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