#VU48235 Use-after-free

Published: 2022-05-12

Vulnerability identifier: #VU48235

Vulnerability risk: High


CVE-ID: CVE-2020-26950


Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Mozilla


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content, caused by MCallGetProperty opcode write side effects. A remote attacker can create a specially crafted web page, trick the victim into opening 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.

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 82.0.2

Firefox ESR: 78.0 - 78.4.0, 68.0 - 68.12.0, 60.0 - 60.9.0


External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

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