CVE-2026-20833: CWE-327: Use of a Broken or Risky Cryptographic Algorithm in Microsoft Windows Server 2008 R2 Service Pack 1
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20833) concerns the use of a broken or risky cryptographic algorithm within the Windows Kerberos authentication protocol on Windows Server 2008 R2 SP1 (version 6.1.7601.0). An authorized attacker with local access can exploit this weakness to disclose information. The issue is classified under CWE-327, indicating improper use of cryptographic algorithms. Microsoft has published an official fix to remediate the vulnerability.
Potential Impact
An authorized local attacker can disclose sensitive information due to the use of a weak cryptographic algorithm in Windows Kerberos. The vulnerability does not affect integrity or availability but impacts confidentiality. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update referenced in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833 to remediate this vulnerability.
CVE-2026-20833: CWE-327: Use of a Broken or Risky Cryptographic Algorithm in Microsoft Windows Server 2008 R2 Service Pack 1
Description
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Microsoft
Windows Server 2008 R2 Service Pack 1
Microsoft
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Microsoft
Windows Server 2008 Service Pack 2
Microsoft
Windows Server 2008 Service Pack 2 (Server Core installation)
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
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-2026-20833) concerns the use of a broken or risky cryptographic algorithm within the Windows Kerberos authentication protocol on Windows Server 2008 R2 SP1 (version 6.1.7601.0). An authorized attacker with local access can exploit this weakness to disclose information. The issue is classified under CWE-327, indicating improper use of cryptographic algorithms. Microsoft has published an official fix to remediate the vulnerability.
Potential Impact
An authorized local attacker can disclose sensitive information due to the use of a weak cryptographic algorithm in Windows Kerberos. The vulnerability does not affect integrity or availability but impacts confidentiality. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update referenced in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833 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-2026-20833","vendor":"Microsoft"}]
Threat ID: 69668adda60475309f9adff0
Added to database: 01/13/2026, 18:11:41 UTC
Last enriched: 07/30/2026, 23:55:48 UTC
Last updated: 09/10/2026, 22:26:03 UTC
Views: 250
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