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Windows Network Controller (NC) Host Agent

CVE-2026-44805 — Windows Network Controller (NC) Host Agent Denial of Service Vulnerability

Important CVSS 5.5 EPSS 0.00327 2026-06 archive

Executive Summary

Use after free in Windows Network Controller (NC) Host Agent allows an authorized attacker to deny service locally.

Overview

5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
Category Denial of Service
Weakness CWE-416: Use After Free
Released Jun 9 2026
Last Updated Jun 9 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00327 — 0.24268 percentile
NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8

EPSS Score

0.00327
probability of exploitation in the next 30 days
0.24268 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2019 5094123 (Security Update) Important Denial of Service Yes
Windows Server 2019 (Server Core installation) 5094123 (Security Update) Important Denial of Service Yes
Windows Server 2022 5094128 (Security Update) Important Denial of Service Yes
Windows Server 2022 (Server Core installation) 5094128 (Security Update) Important Denial of Service Yes
Windows Server 2025 5094125 (Security Update) Important Denial of Service Yes
Windows Server 2025 (Server Core installation) 5094125 (Security Update) Important Denial of Service Yes

Patches

3 patches
Article Type Restart
5094123 Security Update Yes
5094128 Security Update Yes
5094125 Security Update Yes

Known Exploits

Acknowledgments

Microsoft

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