CVE-2024-6603

Name: CVE-2024-6603
Creator: NVD / NIST
Published: 2024-07-09T15:15:12.533+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2024-6603 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. In an out-of-memory scenario an allocation could fail but free would have been called on the pointer afterwards leading to memory corruption. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

In an out-of-memory scenario an allocation could fail but free would have been called on the pointer afterwards leading to memory corruption. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

0.53%

40.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-823

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.13
Mozilla	Firefox	< 128.0
Mozilla	Thunderbird	< 115.13
Mozilla	Thunderbird	>= 116.0, < 128.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1895081Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2024-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-32/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1895081Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2024-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-32/Vendor Advisory

Timeline

Published: Jul 9, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-6603?

How severe is CVE-2024-6603?

CVE-2024-6603 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2024-6603?

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-2024-6603?

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

Scan your code now

Source: NVD / NIST