Vulnerability identifier: #VU52336

Vulnerability risk: High

CVSSv3.1:

CVE-ID: CVE-2021-23997

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error caused by unexpected data type conversions when freeing fonts from cache. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 87.0

---

CPE

• cpe:2.3:a:mozilla:mozilla_firefox:87.0:*:*:*:*:*:*:*

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2021-16/

---

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?