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Vulnerability record · CVE-2023-4050 · published 1 August 2023

CVE-2023-4050: Mozilla firefox out-of-bounds write vulnerability

Mozilla · Firefox

In some cases, an untrusted input stream was copied to a stack buffer without checking its size. This resulted in a potentially exploitable crash which could have led to a sandbox escape. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

7.5 CVSS 3.1 High EPSS 13% · top 3.9% CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

In some cases, an untrusted input stream was copied to a stack buffer without checking its size. This resulted in a potentially exploitable crash which could have led to a sandbox escape. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1843038 Issue TrackingPermissions Required
https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
https://www.debian.org/security/2023/dsa-5464 Third Party Advisory
https://www.debian.org/security/2023/dsa-5469 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-29/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-30/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-31/ Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1843038 Issue TrackingPermissions Required
https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
https://www.debian.org/security/2023/dsa-5464 Third Party Advisory
https://www.debian.org/security/2023/dsa-5469 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-29/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-30/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-31/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-4050), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.