CVE-2024-8383

Name: CVE-2024-8383
Creator: NVD / NIST
Published: 2024-09-03T13:15:05.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2024-8383 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems don't have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Firefox ESR < 115.15.

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

0.64%

45.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1188

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 130.0
Mozilla	Firefox Esr	< 115.15
Mozilla	Firefox Esr	>= 128.0, < 128.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1908496Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2024-39/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-40/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-41/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00012.html
https://lists.debian.org/debian-lts-announce/2024/09/msg00025.html

Timeline

Published: Sep 3, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-8383?

How severe is CVE-2024-8383?

CVE-2024-8383 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2024-8383?

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-2024-8383?

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

Scan your code now

Source: NVD / NIST