Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
The authentication feature could be bypassed as this vulnerability allows impersonation.
How could an attacker exploit this vulnerability?
An unauthenticated attacker could connect over the network to an affected iSCSI Target Server and send specially crafted authentication data. Successful exploitation could bypass CHAP authentication and allow unauthorized access to mapped storage. User interaction is not required.
Security updates
10.0.17763.9245 — https://support.microsoft.com/help/5122876
10.0.20348.5622 — https://support.microsoft.com/help/5122882
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.14393.9512 — https://support.microsoft.com/help/5123099
6.2.9200.26349 — https://support.microsoft.com/help/5123065
6.3.9600.23398 — https://support.microsoft.com/help/5123066
Vulnerabilities 1
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Critical 9.8
Windows iSCSI Security Feature Bypass Vulnerability
Weak authentication in Windows iSCSI allows an unauthorized attacker to bypass a security feature over a network.
Revision history
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#1
Information published.
References
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CVE-2026-73025 Windows iSCSI Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73025
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss