CVE-2021-29970 — Use After Free in Mozilla Firefox

CWE-416 — Use After FreeCWE-787 — Out-of-bounds Write12 documents8 sources
Severity
8.8HIGHNVD
OSV5.9
EPSS
0.7%
top 26.99%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedAug 5
Latest updateMay 24

Description

A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. 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-822v-pgr4-6w5g: A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-08-31
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CVEList
CVE-2021-29970: A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash↗2021-08-05
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OSV
CVE-2021-29970: A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash↗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: Use-after-free in accessibility features of a document↗2021-07-13
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Debian
CVE-2021-29970: firefox - A malicious webpage could have triggered a use-after-free, memory corruption, an...↗2021
▶
Mozilla
Mozilla Foundation Security Advisory 2021-28: CVE-2021-29970↗
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CVE-2021-29970 — Use After Free in Mozilla Firefox | cvebase