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MSRC compact vulnerability detail

CVE-2026-40401 · Windows TCP/IP Denial of Service Vulnerability

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service locally.

Severity
Important
Impact
Denial of Service
CVSS
7.1 base · 6.2 temporal
Release
2026-05-12
Signals
Windows TCP/IP Denial of Service Exploited: No Publicly disclosed: No Exploitability: Exploitation Unlikely
CWE
CWE-476: NULL Pointer Dereference
Patch Diff
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Description
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service locally.
FAQ / Articles
FAQ
According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? In this case, a successful attack could be performed from a low privilege Hyper-V guest. The attacker could traverse the guest's security boundary to cause denial of service on the Hyper-V host environment.