PT-2021-15631 · Mozilla+4 · Firefox+4

Masato Kinugawa + 1 · Published 2021-02-23 · Updated 2024-12-12 · CVE-2021-23974

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Firefox versions prior to 86

Description: The DOMParser API did not properly process '' elements for escaping, which could be used as an mXSS vector to bypass an HTML Sanitizer.

Recommendations: For Firefox versions prior to 86, update to version 86 or later to resolve the issue. As a temporary workaround, consider restricting the use of the DOMParser API until a patch is available. Avoid using the DOMParser API to process user-supplied HTML content that may contain '' elements until the issue is resolved.

Exploit

Fix

Related Identifiers

ALT-PU-2021-1428

ALT-PU-2021-2725

ALT-PU-2021-2881

ALT-PU-2021-3368

ALT-PU-2021-3369

ALT-PU-2022-1781

ALT-PU-2022-1782

CVE-2021-23974

OESA-2023-1673

OESA-2023-1674

OPENSUSE-SU-2024:10600-1

OPENSUSE-SU-2024:14572-1

USN-4756-1

Affected Products

Alt Linux

Astra Linux

Firefox

Linuxmint

Ubuntu

References · 2186

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/firefox_jit_use_after_free.rb · Exploit
• 🔥 https://github.com/mistymntncop/CVE-2022-26485 · Exploit
• 🔥 https://github.com/aleksejspopovs/cve-2020-16012 · Exploit
• 🔥 https://github.com/R0jhack/CVE-2020-6514 · Exploit
• 🔥 https://github.com/hasan-khalil/CVE-2020-6514 · Exploit
• 🔥 https://github.com/HassanAzze/CVE-2020-6514 · Exploit
• 🔥 https://github.com/rojhack/CVE-2020-6514 · Exploit
• 🔥❌ https://github.com/marcinguy/CVE-2020-15999 · Exploit, Deleted
• https://nvd.nist.gov/vuln/detail/CVE-2023-29535 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2022-45418 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-23965 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-15673 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23974 · Security Note
• https://osv.dev/vulnerability/CVE-2021-23974 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-23971 · Vendor Advisory