CVE-2021-23954 — Type Confusion in Mozilla Firefox

CWE-843 — Type Confusion12 documents9 sources
Severity
8.8HIGHNVD
EPSS
0.3%
top 51.47%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedFeb 26
Latest updateMay 24

Description

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

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 Packages7 packages

▶CVEListV5mozilla/firefox< 85
▶NVDmozilla/firefox< 85.0
▶CVEListV5mozilla/firefox_esr< 78.7
▶CVEListV5mozilla/thunderbird< 78.7

🔴Vulnerability Details

3
GHSA
GHSA-5hq3-8hcw-572m: Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a p↗2022-05-24
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CVEList
CVE-2021-23954: Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a p↗2021-02-26
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OSV
CVE-2021-23954: Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a p↗2021-02-26
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2021-02-16
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Ubuntu
Firefox vulnerabilities↗2021-02-01
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Red Hat
Mozilla: Type confusion when using logical assignment operators in JavaScript switch statements↗2021-01-26
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Debian
CVE-2021-23954: firefox - Using the new logical assignment operators in a JavaScript switch statement coul...↗2021
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Mozilla
Mozilla Foundation Security Advisory 2021-04: CVE-2021-23954↗
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CVE-2021-23954 — Type Confusion in Mozilla Firefox | cvebase