CVE-2023-4049

Description

Race conditions in reference counting code were found through code inspection. These could have resulted in potentially exploitable use-after-free vulnerabilities. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.34%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox ESR
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1842658 issue tracking permissions required
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://www.debian.org/security/2023/dsa-5464 third party advisory
https://www.debian.org/security/2023/dsa-5469 third party advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html

Frequently Asked Questions

What is the severity of CVE-2023-4049?
CVE-2023-4049 has been scored as a medium severity vulnerability.
How to fix CVE-2023-4049?
To fix CVE-2023-4049, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-4049 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-4049 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-4049?
CVE-2023-4049 affects Mozilla Firefox, Mozilla Firefox ESR, Mozilla Firefox ESR.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.