How severe is CVE-2025-6663?

CVE-2025-6663 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-6663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6663?

CVE-2025-6663 affects Gstreamer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6663?

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-2025-6663 have an EU (EUVD) identifier?

Yes. CVE-2025-6663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20240.

When was CVE-2025-6663 published?

CVE-2025-6663 was published on 2025-07-07 and last updated on 2026-06-17.

CVE-2025-6663

CVE-2025-6663 is a high-severity vulnerability in Gstreamer with a CVSS 3.x base score of 7.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20240
Weakness: CWE-787
Affected product: Gstreamer
Published: 2025-07-07
Last modified: 2026-06-17

Description

GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the parsing of H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Frequently asked questions

What is CVE-2025-6663?: GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the parsing of H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.
How severe is CVE-2025-6663?: CVE-2025-6663 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-6663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6663?: CVE-2025-6663 affects Gstreamer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6663?: 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-2025-6663 have an EU (EUVD) identifier?: Yes. CVE-2025-6663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20240.
When was CVE-2025-6663 published?: CVE-2025-6663 was published on 2025-07-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*

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