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Windows CVE-2026-20837

HIGH
Heap-based Buffer Overflow (CWE-122)
2026-01-13 secure@microsoft.com
Windows Buffer Overflow Heap Overflow Windows Server 2025 Windows Server 2019 Windows 11 25h2 Windows Server 2022 23h2 Windows Server 2022 Windows 10 21h2 Windows 10 1809 Windows 11 24h2 Windows 11 23h2 Windows 10 22h2 Microsoft
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

DescriptionCVE.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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
User opens crafted media file
Exploit
Windows Media parser processes malformed header
Execution
Heap buffer overflow triggered
Impact
Arbitrary code execution in Media process context
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Vulnerability AssessmentAI

Exploitation Local file system access required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker without authentication could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-20837 vulnerability details – vuln.today
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