CVE-2023-4577
MEDIUMFirefox < 117.0 and Firefox ESR < 115.2 - Use-After-Free in UpdateRegExpStatics
Title source: llmDescription
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.
References (4)
Core 4
Core References
Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1847397
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-34/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-36/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-38/
Scores
CVSS v3
6.5
EPSS
0.0010
EPSS Percentile
27.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
Status
published
Products (3)
mozilla/firefox
< 117.0
mozilla/firefox_esr
< 115.2
mozilla/thunderbird
< 115.2
Published
Sep 11, 2023
Tracked Since
Feb 18, 2026