CVE-2023-37209

Name: CVE-2023-37209
Creator: NVD / NIST
Published: 2023-07-05T10:15:09.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2023-37209 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A use-after-free condition existed in `NotifyOnHistoryReload` where a `LoadingSessionHistoryEntry` object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

A use-after-free condition existed in `NotifyOnHistoryReload` where a `LoadingSessionHistoryEntry` object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. This vulnerability affects Firefox < 115.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.50%

38.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1837993Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1837993Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-22/Vendor Advisory

Timeline

Published: Jul 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-37209?

How severe is CVE-2023-37209?

CVE-2023-37209 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2023-37209?

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-2023-37209?

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

Scan your code now

Source: NVD / NIST