Vulnerability identifier: #VU52334
Vulnerability risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-23995
CWE-ID:
CWE-416
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Mozilla Firefox
Client/Desktop applications /
Web browsers
Firefox ESR
Client/Desktop applications /
Web browsers
Vendor: Mozilla
Description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input, when Responsive Design Mode is enabled. A remote attacker can create a specially crafted web page, trick the victim into opening it using the affected software, trigger a use-after-fee error and execute arbitrary code on the target system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Mozilla Firefox: 8.0.1 - 87.0
Firefox ESR: 60.0 - 60.9.0, 68.0 - 68.12.0, 78.0 - 78.9.0
External links
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
