PT-2021-7957 · Mozilla+1 · Firefox+1

Atila Butkovits · Published 2021-12-07 · Updated 2023-07-11 · CVE-2021-4128

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 95

Description The issue is related to a graphics object not being correctly protected when transitioning in and out of fullscreen mode, resulting in memory corruption and a potentially exploitable crash. This problem affects Firefox on MacOS, with other operating systems being unaffected. The vulnerability is also described as a use-after-free issue, which could allow a remote attacker to cause a denial of service.

Recommendations For versions prior to 95, update to version 95 or later to resolve the issue. As a temporary workaround, consider avoiding the use of fullscreen mode in Firefox on MacOS until the update is applied.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2023-4336

ALT-PU-2023-4339

BDU:2023-07573

CVE-2021-4128

Affected Products

Alt Linux

Firefox

References · 12

• 🔥 https://github.com/mistymntncop/CVE-2022-1802 · Exploit
• 🔥 https://github.com/0vercl0k/CVE-2022-28281 · Exploit
• 🔥 https://github.com/mistymntncop/CVE-2022-26485 · Exploit
• 🔥❌ https://github.com/MagicPwnrin/CVE-2022-28282 · Exploit, Deleted
• 🔥❌ https://github.com/Pwnrin/CVE-2022-28282 · Exploit, Deleted
• 🔥 https://bugzilla.mozilla.org/show_bug.cgi?id=1735852 · Exploit
• https://mozilla.org/security/advisories/mfsa2021-52 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-4128 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4128 · Security Note
• https://bdu.fstec.ru/vul/2023-07573 · Security Note
• https://osv.dev/vulnerability/CVE-2021-4128 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2021-52 · Vendor Advisory