CVE-2023-4577

Memory corruption in JIT UpdateRegExpStatics

At a glance

Severity: Not available
EPSS: EPSS 0.65 % · percentile 51 (2026-10-27)
State: PUBLISHED
Published: 2023-09-11
Updated: 2025-12-18
Assigner: mozilla
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2023-54431
GCVE · GCVE-0-2023-4577

CERT-FR advisories

CERTFR-2023-AVI-0703 — Multiples vulnérabilités dans Thunderbird · cert.ssi.gouv.fr
CERTFR-2023-AVI-0695 — Multiples vulnérabilités dans les produits Mozilla · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* < 117.0
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* < 115.2
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* < 115.2

Affected products

Product	Versions
Mozilla · Firefox	affected unspecified < 117
Mozilla · Firefox ESR	affected unspecified < 115.2
Mozilla · Thunderbird	affected unspecified < 115.2

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD