#VU26649 Out-of-bounds read in Mozilla Firefox

Published: 2020-04-07

Vulnerability identifier: #VU26649

Vulnerability risk: Medium


CVE-ID: CVE-2020-6821


Exploitation vector: Network

Exploit availability:

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

Vendor: Mozilla


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when using WebGL copyTexSubImage method. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of uninitialized memory on the system.

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Vulnerable software versions

Mozilla Firefox: 60.0 - 74.0.1

Fixed software versions


External links

Q & A

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Is there known malware, which exploits this vulnerability?

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