CVE-2021-23987 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds WriteCWE-120 — Classic Buffer OverflowCWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer15 documents8 sources
Severity
8.8HIGHNVD
OSV8.1OSV7.4
EPSS
0.3%
top 51.70%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedMar 31
Latest updateMay 24

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

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 Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 87
▶NVDmozilla/firefox< 87.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.9
▶Ubuntumozilla/firefox< 87.0+build3-0ubuntu0.16.04.2+2

Patches

Patch: bugzilla.mozilla.org ↗Patch: bugzilla.mozilla.org ↗

🔴Vulnerability Details

6
GHSA
GHSA-5597-54m5-f56x: Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-06-25
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OSV
thunderbird vulnerabilities↗2021-06-22
▶
CVEList
CVE-2021-23987: Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78↗2021-03-31
▶
OSV
CVE-2021-23987: Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78↗2021-03-31
▶

📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2021-06-25
▶
Ubuntu
Thunderbird vulnerabilities↗2021-06-22
▶
Ubuntu
Firefox vulnerabilities↗2021-03-25
▶
Red Hat
Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9↗2021-03-23
▶
Debian
CVE-2021-23987: firefox - Mozilla developers and community members reported memory safety bugs present in ...↗2021
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CVE-2021-23987 — Out-of-bounds Write in Mozilla Firefox | cvebase