CVE-2026-20812: CWE-20: Improper Input Validation in Microsoft Windows 10 Version 1607
Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20812) affects Windows 10 Version 1607 (build 10.0.14393.0) and involves improper input validation in the Lightweight Directory Access Protocol (LDAP) implementation. The flaw permits an attacker with some level of authorization to tamper with data over the network. The CVSS v3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, and no user interaction required. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
An authorized attacker can exploit this vulnerability to tamper with LDAP data over the network, potentially impacting the integrity of the system or data. There is no confidentiality or availability impact indicated. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20812 for detailed patching instructions.
CVE-2026-20812: CWE-20: Improper Input Validation in Microsoft Windows 10 Version 1607
Description
Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2022, 23H2 Edition (Server Core installation)
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20812) affects Windows 10 Version 1607 (build 10.0.14393.0) and involves improper input validation in the Lightweight Directory Access Protocol (LDAP) implementation. The flaw permits an attacker with some level of authorization to tamper with data over the network. The CVSS v3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, and no user interaction required. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
An authorized attacker can exploit this vulnerability to tamper with LDAP data over the network, potentially impacting the integrity of the system or data. There is no confidentiality or availability impact indicated. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20812 for detailed patching instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.372Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20812","vendor":"Microsoft"}]
Threat ID: 69668adaa60475309f9adf52
Added to database: 01/13/2026, 18:11:38 UTC
Last enriched: 07/30/2026, 23:50:07 UTC
Last updated: 09/10/2026, 22:26:08 UTC
Views: 159
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