Mozilla Firefox Use-After-Free Vulnerability
Mozilla Firefox and Firefox ESR contain a use-after-free vulnerability in Animation timelines that allows for code execution in the content process.
- Vendor
- Mozilla
- Product
- Firefox
- CVSS
- 9.8
- EPSS (exploit probability)
- 23.2%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2024-9680 being exploited?
Yes. CISA added CVE-2024-9680 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 23.2% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-19. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Mozilla Firefox CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-15719 Firefox DOM Navigation site-isolation flaw with public exploit codewrite-up | [ MEDIUM ] | 5.4 | 0.3% | — |
| CVE-2026-15718 Firefox JavaScript/WebAssembly invalid pointer with public exploit codewrite-up | [ MEDIUM ] | 4.3 | 0.5% | — |
| CVE-2026-10702 JIT miscompilation in Firefox JavaScript engine allows renderer code executionwrite-up | [ MEDIUM ] | 4.3 | 0.9% | — |
| CVE-2015-4495 Mozilla Firefox Security Feature Bypass Vulnerability | [ HIGH ] | 8.8 | 68.6% | |
| CVE-2022-26486 Mozilla Firefox Use-After-Free Vulnerability | [ CRITICAL ] | 9.6 | 2.4% | |
| CVE-2022-26485 Mozilla Firefox Use-After-Free Vulnerability | [ HIGH ] | 8.8 | 14.3% | |
| CVE-2013-1675 Mozilla Firefox Information Disclosure Vulnerability | [ MEDIUM ] | 6.5 | 6.7% |