Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by sending specially crafted FTP commands that exceed the expected length to a vulnerable FTP service. When the service processes and logs these oversized commands, it may write beyond the bounds of allocated memory, causing memory corruption that could lead to a service crash or allow code execution.
Security updates
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.22631.7376 — https://support.microsoft.com/help/5099414
10.0.14393.9339 — https://support.microsoft.com/help/5099535
10.0.28000.2525 — https://support.microsoft.com/help/5101649
Vulnerabilities 1
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Critical 9.8
Windows FTP Service Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows FTP Service allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-49172 Windows FTP Service Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49172
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss