CVE-2024-3859

Name: CVE-2024-3859
Creator: NVD / NIST
Published: 2024-04-16T16:15:08.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2024-3859 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. On 32-bit versions there were integer-overflows that led to an out-of-bounds-read that potentially could be triggered by a malformed OpenType font. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

On 32-bit versions there were integer-overflows that led to an out-of-bounds-read that potentially could be triggered by a malformed OpenType font. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

0.66%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.10
Mozilla	Firefox	< 125.0
Mozilla	Thunderbird	< 115.10
Debian	Debian Linux	10.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1874489Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/04/msg00012.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00013.htmlMailing List, Third Party Advisory
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=1874489Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/04/msg00012.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00013.htmlMailing List, Third Party Advisory
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: Analyzed

Frequently Asked Questions

What is CVE-2024-3859?

How severe is CVE-2024-3859?

CVE-2024-3859 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2024-3859?

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-2024-3859?

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

Scan your code now

Source: NVD / NIST