High MSRC-CVE-2026-49177 1 CVE

Windows TCP/IP Information Disclosure Vulnerability

Published Jul 14, 2026 · Updated Aug 31, 2026 · Revision 3

Vendor: Microsoft

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649
10.0.14393.9339 — https://support.microsoft.com/help/5099535
6.2.9200.26226 — https://support.microsoft.com/help/5099445
6.3.9600.23291 — https://support.microsoft.com/help/5099444

Vulnerabilities 1

Medium 5.5

CVE-2026-49177

Windows TCP/IP Information Disclosure Vulnerability

Out-of-bounds read in Windows TCP/IP allows an authorized attacker to disclose information locally.

Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows 10 Version 1809 Windows

Jul 14, 2026

Revision history

2026-08-31 #3
Updated an acknowledgement. This is an informational change only.
2026-08-20 #2
Updated an acknowledgement. This is an informational change only.
2026-07-14 #1
Information published.

References

CVE-2026-49177 Windows TCP/IP Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49177
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss