CVE-2024-9403

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-01 · updated 2026-06-17
Weakness: CWE-119

Description

Memory safety bugs present in Firefox 130. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 131 and Thunderbird < 131.

Affected products

Mozilla Firefox: before 131.0 — fixed in 131.0
Mozilla Thunderbird: before 131.0 — fixed in 131.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 131.0; Mozilla Thunderbird 131.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1917807
https://www.mozilla.org/security/advisories/mfsa2024-46/
https://www.mozilla.org/security/advisories/mfsa2024-50/

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