CVE-2024-7527

Name: CVE-2024-7527
Creator: NVD / NIST
Published: 2024-08-06T13:15:57.543+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2024-7527 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Unexpected marking work at the start of sweeping could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

Unexpected marking work at the start of sweeping could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.57%

42.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 129.0
Mozilla	Firefox Esr	< 115.14.0
Mozilla	Firefox Esr	128.0
Mozilla	Thunderbird	< 115.14.0
Mozilla	Thunderbird	128.0.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1871303Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2024-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-34/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-35/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-37/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-38/Vendor Advisory

Timeline

Published: Aug 6, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-7527?

How severe is CVE-2024-7527?

CVE-2024-7527 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2024-7527?

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-2024-7527?

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

Scan your code now

Source: NVD / NIST