CVE-2026-56181CWE-346

Windows Network Address Translation (NAT) Spoofing Vulnerability

High · published July 14, 2026

CVSS v3.1
8.3
EPSS
0%
Percentile
19.0
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.3 · HIGH
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00276 · 19.0th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-07-14T17:10Z
EPSS history
Timeline
  • 14 JUL 17:10Z
    Windows Network Address Translation (NAT) Spoofing Vulnerability
    cvelistv5