CVE-2026-77889: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 10 Version 1607
CVE-2026-77889 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 involving type confusion in the DHCP Server component. This flaw allows an unauthorized attacker to cause a denial of service over a network by accessing a resource using an incompatible type. The vulnerability has a CVSS score of 7.5 and has been officially fixed by Microsoft.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-843 (Access of Resource Using Incompatible Type), affects the DHCP Server in Windows 10 Version 1607 (build 10.0.14393.0). It enables an unauthorized attacker to trigger a denial of service condition remotely by exploiting type confusion in resource access. Microsoft has published an official fix for this issue, mitigating the risk of exploitation.
Potential Impact
An attacker can cause a denial of service on affected Windows 10 Version 1607 systems by exploiting the type confusion vulnerability in the DHCP Server. This results in service disruption but does not impact confidentiality or integrity according to the CVSS vector.
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-2026-77889 to remediate this vulnerability.
CVE-2026-77889: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 10 Version 1607
Description
CVE-2026-77889 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 involving type confusion in the DHCP Server component. This flaw allows an unauthorized attacker to cause a denial of service over a network by accessing a resource using an incompatible type. The vulnerability has a CVSS score of 7.5 and has been officially fixed by Microsoft.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-843 (Access of Resource Using Incompatible Type), affects the DHCP Server in Windows 10 Version 1607 (build 10.0.14393.0). It enables an unauthorized attacker to trigger a denial of service condition remotely by exploiting type confusion in resource access. Microsoft has published an official fix for this issue, mitigating the risk of exploitation.
Potential Impact
An attacker can cause a denial of service on affected Windows 10 Version 1607 systems by exploiting the type confusion vulnerability in the DHCP Server. This results in service disruption but does not impact confidentiality or integrity according to the CVSS vector.
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-2026-77889 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-21T17:26:55.611Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77889","vendor":"Microsoft"}]
Threat ID: 6aa04559acd9273b49fa9fd8
Added to database: 09/08/2026, 17:26:49 UTC
Last enriched: 09/08/2026, 21:52:18 UTC
Last updated: 09/08/2026, 21:52:18 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.