CVE-2026-20837: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1809
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20837) involves a heap-based buffer overflow in Windows Media on Windows 10 Version 1809. An attacker with local access and user interaction can exploit this flaw to execute arbitrary code, potentially leading to full system compromise. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow) and affects Windows 10 Version 1809 (build 10.0.17763.0). Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthorized local attacker to execute arbitrary code, resulting in complete compromise of confidentiality, integrity, and availability of the affected system. The vulnerability requires user interaction but no privileges, making it a significant local threat.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20837 to remediate this vulnerability.
CVE-2026-20837: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1809
Description
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20837) involves a heap-based buffer overflow in Windows Media on Windows 10 Version 1809. An attacker with local access and user interaction can exploit this flaw to execute arbitrary code, potentially leading to full system compromise. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow) and affects Windows 10 Version 1809 (build 10.0.17763.0). Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthorized local attacker to execute arbitrary code, resulting in complete compromise of confidentiality, integrity, and availability of the affected system. The vulnerability requires user interaction but no privileges, making it a significant local threat.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20837 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.375Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20837","vendor":"Microsoft"}]
Threat ID: 69668adea60475309f9ae091
Added to database: 01/13/2026, 18:11:42 UTC
Last enriched: 07/30/2026, 23:47:02 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 200
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