CVE-2023-4577

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CVSS 3.1

6.5 medium

EPSS

<1%p49

Published

Sep 11, 2023 (Sep 11, 2023)

Modified

Jun 17, 2026

Description

When `UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Vendors: mozilla
Products: firefox, firefox esr, thunderbird
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.7%)

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