Windows Server 2025
CVE-2026-20837
HIGH
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Windows Media affects Windows 11 25h2, Windows Server 2019, and Windows Server 2025 through a heap buffer overflow that requires user interaction to trigger. An attacker with local access can exploit this vulnerability to achieve arbitrary code execution with full system privileges. No patch is currently available for this vulnerability.
Technical ContextAI
Classified as CWE-122 (Heap-based Buffer Overflow). Affects Windows 10 1809. Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today