Buffer overflow in Gstreamer
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (27.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Gstreamer — versions 97fec43422c4b62d569957d721c899bdaaa9da61
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-25-467/ (x_research-advisory, Third Party Advisory)
- gitlab.freedesktop.org/tpm/gstreamer/-/commit/eedd01ac3dfeb60e36a44bb61a6d04184… (vendor-advisory, Patch)
Frequently asked questions
- What is CVE-2025-6663?
- CVE-2025-6663 is a high-severity vulnerability in Gstreamer, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2025-07-07.
- How severe is CVE-2025-6663?
- High severity. CVSS v3 base score is 7.8 out of 10.