CVE-2021-38495 — Out-of-bounds Write in Mozilla Firefox ESR

CWE-787 — Out-of-bounds WriteCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-120 — Classic Buffer Overflow10 documents8 sources
Severity
8.8HIGHNVD
EPSS
0.5%
top 32.06%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedNov 3
Latest updateMay 24

Description

Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. 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 < 91.1 and Firefox ESR < 91.1.

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/thunderbirdunspecified — 91.1
▶Ubuntumozilla/thunderbird< 1:91.5.0+build1-0ubuntu0.18.04.1+1
▶CVEListV5mozilla/firefox_esrunspecified — 91.1

🔴Vulnerability Details

4
GHSA
GHSA-whqc-prwr-5mvr: Mozilla developers reported memory safety bugs present in Thunderbird 78↗2022-05-24
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OSV
thunderbird vulnerabilities↗2022-01-21
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CVEList
CVE-2021-38495: Mozilla developers reported memory safety bugs present in Thunderbird 78↗2021-11-03
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OSV
CVE-2021-38495: Mozilla developers reported memory safety bugs present in Thunderbird 78↗2021-11-03
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📋Vendor Advisories

5
Ubuntu
Thunderbird vulnerabilities↗2022-01-21
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Red Hat
Mozilla: Memory safety bugs fixed in Firefox 92 and Firefox ESR 91.1↗2021-09-07
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Debian
CVE-2021-38495: thunderbird - Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. S...↗2021
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Mozilla
Mozilla Foundation Security Advisory 2021-40: CVE-2021-38495↗
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Mozilla
Mozilla Foundation Security Advisory 2021-41: CVE-2021-38495↗
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CVE-2021-38495 — Out-of-bounds Write in Mozilla | cvebase