CVE-2023-4055

Name: CVE-2023-4055
Creator: NVD / NIST
Published: 2023-08-01T16:15:09.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2023-4055 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. When the number of cookies per domain was exceeded in `document.cookie`, the actual cookie jar sent to the host was no longer consistent with expected cookie jar state. This could have caused requests to be sent with some cookies missing. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

When the number of cookies per domain was exceeded in `document.cookie`, the actual cookie jar sent to the host was no longer consistent with expected cookie jar state. This could have caused requests to be sent with some cookies missing. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.61%

44.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 116.0
Mozilla	Firefox	>= 102.0, < 102.14
Mozilla	Firefox	>= 115.0, < 115.1
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1782561Issue Tracking, Permissions 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-5464Third Party Advisory
https://www.debian.org/security/2023/dsa-5469Third 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=1782561Issue Tracking, Permissions 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-5464Third Party Advisory
https://www.debian.org/security/2023/dsa-5469Third 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

Timeline

Published: Aug 1, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4055?

How severe is CVE-2023-4055?

CVE-2023-4055 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4055?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4055?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST