CVE-2026-56181

high

Description

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56181

Details

Source: Mitre, NVD

Published: 2026-07-14

Updated: 2026-07-14

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:A/AC:H/Au:N/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 8.3

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00242