CVE-2024-3863

Name: CVE-2024-3863
Creator: NVD / NIST
Published: 2024-04-16T16:15:08.87+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2024-3863 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.10.0
Mozilla	Firefox	< 125.0
Mozilla	Thunderbird	< 115.10

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1885855Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2024-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-19/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-20/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1885855Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2024-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-19/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-20/Vendor Advisory

Timeline

Published: Apr 16, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-3863?

How severe is CVE-2024-3863?

CVE-2024-3863 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2024-3863?

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-2024-3863?

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

Scan your code now

Source: NVD / NIST