How severe is CVE-2025-9951?

CVE-2025-9951 has a CVSS 4.0 base score of 7.2, rated high severity.

Is CVE-2025-9951 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-9951?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-9951 have an EU (EUVD) identifier?

Yes. CVE-2025-9951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27255.

When was CVE-2025-9951 published?

CVE-2025-9951 was published on 2025-09-09 and last updated on 2026-06-17.

CVE-2025-9951

CVE-2025-9951 is a high-severity vulnerability with a CVSS 4.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 4.0 base score 7.2)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27255
Weakness: CWE-122
Published: 2025-09-09
Last modified: 2026-06-17

Description

A heap-buffer-overflow write exists in jpeg2000dec FFmpeg which allows an attacker to potentially gain remote code execution or cause denial of service via the channel definition cdef atom of JPEG2000.

Frequently asked questions

What is CVE-2025-9951?: A heap-buffer-overflow write exists in jpeg2000dec FFmpeg which allows an attacker to potentially gain remote code execution or cause denial of service via the channel definition cdef atom of JPEG2000.
How severe is CVE-2025-9951?: CVE-2025-9951 has a CVSS 4.0 base score of 7.2, rated high severity.
Is CVE-2025-9951 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-9951?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-9951 have an EU (EUVD) identifier?: Yes. CVE-2025-9951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27255.
When was CVE-2025-9951 published?: CVE-2025-9951 was published on 2025-09-09 and last updated on 2026-06-17.

References

https://github.com/google/security-research/security/advisories/GHSA-39q3-f8jq-v6mg

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