CVE-2021-29967 — 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 Buffer16 documents9 sources
Severity
8.8HIGHNVD
OSV7.4OSV4.3
EPSS
0.4%
top 41.46%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedJun 24
Latest updateMay 24

Description

Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11. 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 Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

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 — 89
▶NVDmozilla/firefox< 89.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.11
▶NVDmozilla/firefox_esr< 78.11
▶Ubuntumozilla/firefox< 89.0+build2-0ubuntu0.18.04.2+1

🔴Vulnerability Details

6
GHSA
GHSA-xcvm-2qxh-c4v3: Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-06-25
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OSV
CVE-2021-29967: Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78↗2021-06-24
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CVEList
CVE-2021-29967: Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78↗2021-06-24
▶
OSV
thunderbird vulnerabilities↗2021-06-22
▶

📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2021-06-25
▶
Ubuntu
Thunderbird vulnerabilities↗2021-06-22
▶
Ubuntu
Firefox vulnerabilities↗2021-06-02
▶
Red Hat
Mozilla: Memory safety bugs fixed in Firefox 89 and Firefox ESR 78.11↗2021-06-01
▶
Debian
CVE-2021-29967: firefox - Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox...↗2021
▶

📄Research Papers

1
arXiv
An Investigation into Inconsistency of Software Vulnerability Severity across Data Sources↗2022-01-16
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CVE-2021-29967 — Out-of-bounds Write in Mozilla Firefox | cvebase