CVE-2024-9399

Description

A website configured to initiate a specially crafted WebTransport session could crash the Firefox process leading to a denial of service condition. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.97% Top 25%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Firefox ESR
Affected: Mozilla Thunderbird
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1907726 issue tracking permissions required
https://www.mozilla.org/security/advisories/mfsa2024-46/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2024-47/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2024-49/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2024-50/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2024-9399?
CVE-2024-9399 has been scored as a high severity vulnerability.
How to fix CVE-2024-9399?
To fix CVE-2024-9399, 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-2024-9399 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-9399 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-9399?
CVE-2024-9399 affects Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, Mozilla Thunderbird.
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.