CVE-2020-12420

PoC —

CVSS 3.1

8.8 high

EPSS

2%p78

Published

Jul 9, 2020 (Jul 9, 2020)

Modified

Jun 17, 2026

Description

When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

Vendors: mozilla canonical opensuse
Products: firefox, firefox esr, thunderbird, ubuntu linux, leap
Weakness: CWE-362, CWE-416
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.9%)

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