Vulnerability in Mozilla Firefox
CVE-2024-7521
Incomplete WebAssembly exception handing 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr — versions 128.0
- Mozilla Thunderbird — versions unspecified, 128.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2024-33/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2024-34/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2024-35/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2024-37/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2024-38/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2024-7521?
- CVE-2024-7521 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Handling of Exceptional Conditions. CVSS score: 8.8/10. Published 2024-08-06.
- How severe is CVE-2024-7521?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2024-7521 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.