CVE-2021-29976 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds WriteCWE-120 — Classic Buffer Overflow12 documents8 sources
Severity
8.8HIGHNVD
OSV5.9
EPSS
0.6%
top 30.77%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedAug 5
Latest updateMay 24

Description

Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 < 78.12, Firefox ESR < 78.12, and Firefox < 90.

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 — 90
▶NVDmozilla/firefox< 90.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.12
▶NVDmozilla/firefox_esr< 78.12
▶CVEListV5mozilla/thunderbirdunspecified — 78.12

🔴Vulnerability Details

4
GHSA
GHSA-jv3x-w8ff-cj2g: Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-08-31
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OSV
CVE-2021-29976: Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird↗2021-08-05
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CVEList
CVE-2021-29976: Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird↗2021-08-05
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2021-08-31
▶
Ubuntu
Firefox vulnerabilities↗2021-07-16
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Red Hat
Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12↗2021-07-13
▶
Debian
CVE-2021-29976: firefox - Mozilla developers reported memory safety bugs present in code shared between Fi...↗2021
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Mozilla
Mozilla Foundation Security Advisory 2021-28: CVE-2021-29976↗
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CVE-2021-29976 — Out-of-bounds Write in Mozilla Firefox | cvebase