#VU103825 Improper Authentication in Windows and Windows Server - CVE-2025-21349

Cybersecurity Help s.r.o.

Published: 2025-02-11

Vulnerability identifier: #VU103825

Vulnerability risk: High

CVSSv4.0: 4.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-21349

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in Windows Remote Desktop Configuration Service. A remote attacker can perform a man-in-the-middle (MitM) attack, bypass authentication process and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920, 10 21H2 10.0.19043.4529, 10 21H2 10.0.19044.1147, 10 21H2 10.0.19044.1149, 10 21H2 10.0.19044.1151, 10 21H2 10.0.19044.1165, 10 21H2 10.0.19044.1200, 10 21H2 10.0.19044.1202 - 11 22H2 10.0.22621.4037, 10 21H2 10.0.19044.1237 - 11 24H2 10.0.26100.2161, 10 21H2 10.0.19044.1263, 10 21H2 10.0.19044.1266, 10 21H2 10.0.19044.1288, 10 21H2 10.0.19044.1319, 10 21H2 10.0.19044.1320, 10 21H2 10.0.19044.1348, 10 21H2 10.0.19044.1379, 10 21H2 10.0.19044.1381, 10 21H2 10.0.19044.1387, 10 21H2 10.0.19044.1415, 10 21H2 10.0.19044.1466, 10 21H2 10.0.19044.1469, 10 21H2 10.0.19044.1499, 10 21H2 10.0.19044.1503, 10 21H2 10.0.19044.1526, 10 21H2 10.0.19044.1566, 10 21H2 10.0.19044.1586, 10 21H2 10.0.19044.1618, 10 21H2 10.0.19044.1620, 10 21H2 10.0.19044.1645, 10 21H2 10.0.19044.1679, 10 21H2 10.0.19044.1682, 10 21H2 10.0.19044.1706, 10 21H2 10.0.19044.1708, 10 21H2 10.0.19044.1737, 10 21H2 10.0.19044.1739, 10 21H2 10.0.19044.1741, 10 21H2 10.0.19044.1766, 10 21H2 10.0.19044.1767, 10 21H2 10.0.19044.1806, 10 21H2 10.0.19044.1826, 10 21H2 10.0.19044.1862, 10 21H2 10.0.19044.1865, 10 21H2 10.0.19044.1889, 10 21H2 10.0.19044.1947, 10 21H2 10.0.19044.1949, 10 21H2 10.0.19044.2006, 10 21H2 10.0.19044.2075, 10 21H2 10.0.19044.2130, 10 21H2 10.0.19044.2132, 10 21H2 10.0.19044.2192, 10 21H2 10.0.19044.2193, 10 21H2 10.0.19044.2194, 10 21H2 10.0.19044.2251, 10 21H2 10.0.19044.2311, 10 21H2 10.0.19044.2364, 10 21H2 10.0.19044.2486, 10 21H2 10.0.19044.2545, 10 21H2 10.0.19044.2546, 10 21H2 10.0.19044.2604, 10 21H2 10.0.19044.2673, 10 21H2 10.0.19044.2728, 10 21H2 10.0.19044.2788, 10 21H2 10.0.19044.2846, 10 21H2 10.0.19044.2965, 10 21H2 10.0.19044.3086, 10 21H2 10.0.19044.3208, 10 21H2 10.0.19044.3324, 10 21H2 10.0.19044.3448, 10 21H2 10.0.19044.3570, 10 21H2 10.0.19044.3693, 10 22H2 10.0.19045.2075, 10 22H2 10.0.19045.2130, 10 22H2 10.0.19045.2132, 10 22H2 10.0.19045.2193, 10 22H2 10.0.19045.2194, 10 22H2 10.0.19045.2251, 10 22H2 10.0.19045.2301, 10 22H2 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10.0.17763.1294, 10 1809 10.0.17763.1339, 10 1809 10.0.17763.1369, 10 1809 10.0.17763.1397, 10 1809 10.0.17763.1432, 10 1809 10.0.17763.1457, 10 1809 10.0.17763.1490, 10 1809 10.0.17763.1518, 10 1809 10.0.17763.1554, 10 1809 10.0.17763.1577, 10 1809 10.0.17763.1579, 10 1809 10.0.17763.1613, 10 1809 10.0.17763.1637, 10 1809 10.0.17763.1697, 10 1809 10.0.17763.1728, 10 1809 10.0.17763.1757, 10 1809 10.0.17763.1790, 10 1809 10.0.17763.1817, 10 1809 10.0.17763.1821, 10 1809 10.0.17763.1823, 10 1809 10.0.17763.1852, 10 1809 10.0.17763.1879, 10 1809 10.0.17763.1911, 10 1809 10.0.17763.1935, 10 1809 10.0.17763.1971, 10 1809 10.0.17763.1999, 10 1809 10.0.17763.2028, 10 1809 10.0.17763.2029, 10 1809 10.0.17763.2061, 10 1809 10.0.17763.2090, 10 1809 10.0.17763.2091, 10 1809 10.0.17763.2114, 10 1809 10.0.17763.2145, 10 1809 10.0.17763.2183, 10 1809 10.0.17763.2213, 10 1809 10.0.17763.2237, 10 1809 10.0.17763.2268, 10 1809 10.0.17763.2300, 10 1809 10.0.17763.2305, 10 1809 10.0.17763.2330, 10 1809 10.0.17763.2366, 10 1809 10.0.17763.2369, 10 1809 10.0.17763.2452, 10 1809 10.0.17763.2458, 10 1809 10.0.17763.2510, 10 1809 10.0.17763.2565, 10 1809 10.0.17763.2628, 10 1809 10.0.17763.2686, 10 1809 10.0.17763.2746, 10 1809 10.0.17763.2803, 10 1809 10.0.17763.2867, 10 1809 10.0.17763.2928, 10 1809 10.0.17763.2931, 10 1809 10.0.17763.2989, 10 1809 10.0.17763.3046, 10 1809 10.0.17763.3113, 10 1809 10.0.17763.3165, 10 1809 10.0.17763.3232, 10 1809 10.0.17763.3287, 10 1809 10.0.17763.3346, 10 1809 10.0.17763.3406, 10 1809 10.0.17763.3469, 10 1809 10.0.17763.3532, 10 1809 10.0.17763.3534, 10 1809 10.0.17763.3650, 10 1809 10.0.17763.3653, 10 1809 10.0.17763.3770, 10 1809 10.0.17763.3772, 10 1809 10.0.17763.3887, 10 1809 10.0.17763.4010, 10 1809 10.0.17763.4131, 10 1809 10.0.17763.4252, 10 1809 10.0.17763.4377, 10 1809 10.0.17763.4499, 10 1809 10.0.17763.4645, 10 1809 10.0.17763.4737, 10 1809 10.0.17763.4851, 10 1809 10.0.17763.4974, 10 1809 10.0.17763.5122, 10 1809 10.0.17763.5206, 10 1809 10.0.17763.5329, 10 1809 10.0.17763.5458, 10 1809 10.0.17763.5576, 10 1809 10.0.17763.5579, 10 1809 10.0.17763.5696, 10 1809 10.0.17763.5820, 10 1809 10.0.17763.5936, 10 1809 10.0.17763.6054, 10 1809 10.0.17763.6189, 10 1809 10.0.17763.6293, 10 1809 10.0.17763.6414, 10 1809 10.0.17763.6532, 10 1809 10.0.17763.6659, 10 1809 10.0.17763.6775, 11 22H2 10.0.22449.1000, 11 22H2 10.0.22454.1000, 11 22H2 10.0.22458.1000, 11 22H2 10.0.22463.1000, 11 22H2 10.0.22468.1000, 11 22H2 10.0.22471.1000, 11 22H2 10.0.22478.1000, 11 22H2 10.0.22478.1012, 11 22H2 10.0.22483.1000, 11 22H2 10.0.22483.1011, 11 22H2 10.0.22489.1000, 11 22H2 10.0.22494.1000, 11 22H2 10.0.22499.1000, 11 22H2 10.0.22499.1010, 11 22H2 10.0.22504.1000, 11 22H2 10.0.22504.1010, 11 22H2 10.0.22509.1000, 11 22H2 10.0.22509.1011, 11 22H2 10.0.22518.1000, 11 22H2 10.0.22518.1012, 11 22H2 10.0.22523.1000, 11 22H2 10.0.22526.1000, 11 22H2 10.0.22533.1001, 11 22H2 10.0.22538.1000, 11 22H2 10.0.22538.1010, 11 22H2 10.0.22543.1000, 11 22H2 10.0.22557.1, 11 22H2 10.0.22563.1, 11 22H2 10.0.22567.1, 11 22H2 10.0.22567.100, 11 22H2 10.0.22567.200, 11 22H2 10.0.22572.1, 11 22H2 10.0.22572.100, 11 22H2 10.0.22572.201, 11 22H2 10.0.22579.1, 11 22H2 10.0.22579.100, 11 22H2 10.0.22581.1, 11 22H2 10.0.22581.100, 11 22H2 10.0.22581.200, 11 22H2 10.0.22593.1, 11 22H2 10.0.22598.1, 11 22H2 10.0.22598.100, 11 22H2 10.0.22598.200, 11 22H2 10.0.22610.1, 11 22H2 10.0.22616.1, 11 22H2 10.0.22616.100, 11 22H2 10.0.22621.1, 11 22H2 10.0.22621.105, 11 22H2 10.0.22621.160, 11 22H2 10.0.22621.169, 11 22H2 10.0.22621.232, 11 22H2 10.0.22621.290, 11 22H2 10.0.22621.317, 11 22H2 10.0.22621.382, 11 22H2 10.0.22621.436, 11 22H2 10.0.22621.440, 11 22H2 10.0.22621.450, 11 22H2 10.0.22621.457, 11 22H2 10.0.22621.521, 11 22H2 10.0.22621.525, 11 22H2 10.0.22621.575, 11 22H2 10.0.22621.586, 11 22H2 10.0.22621.590, 11 22H2 10.0.22621.598, 11 22H2 10.0.22621.601, 11 22H2 10.0.22621.607, 11 22H2 10.0.22621.608, 11 22H2 10.0.22621.674, 11 22H2 10.0.22621.675, 11 22H2 10.0.22621.730, 11 22H2 10.0.22621.741, 11 22H2 10.0.22621.746, 11 22H2 10.0.22621.754, 11 24H2 10.0.26100.2240, 11 24H2 10.0.26100.2314, 11 24H2 10.0.26100.2528, 11 24H2 10.0.26100.2605, 11 24H2 10.0.26100.2894

Windows Server: 2016 10.0.14393.10, 2016 10.0.14393.51, 2016 10.0.14393.82, 2016 10.0.14393.105, 2016 10.0.14393.187, 2016 10.0.14393.222, 2016 10.0.14393.321, 2016 10.0.14393.351, 2016 10.0.14393.447, 2016 10.0.14393.479, 2016 10.0.14393.576, 2016 10.0.14393.693, 2016 10.0.14393.953, 2016 10.0.14393.969, 2016 10.0.14393.1066, 2016 10.0.14393.1198, 2016 10.0.14393.1358, 2016 10.0.14393.1378, 2016 10.0.14393.1480, 2016 10.0.14393.1532, 2016 10.0.14393.1537, 2016 10.0.14393.1593, 2016 10.0.14393.1613, 2016 10.0.14393.1670, 2016 10.0.14393.1715, 2016 10.0.14393.1737, 2016 10.0.14393.1770, 2016 10.0.14393.1794, 2016 10.0.14393.1797, 2016 10.0.14393.1884, 2016 10.0.14393.1914, 2016 10.0.14393.1944, 2016 10.0.14393.2007, 2016 10.0.14393.2035, 2016 10.0.14393.2068, 2016 10.0.14393.2097, 2016 10.0.14393.2125, 2016 10.0.14393.2155, 2016 10.0.14393.2156, 2016 10.0.14393.2189, 2016 10.0.14393.2214, 2016 10.0.14393.2248, 2016 10.0.14393.2273, 2016 10.0.14393.2312, 2016 10.0.14393.2339, 2016 10.0.14393.2363, 2016 10.0.14393.2368, 2016 10.0.14393.2395, 2016 10.0.14393.2396, 2016 10.0.14393.2430, 2016 10.0.14393.2457, 2016 10.0.14393.2485, 2016 10.0.14393.2515, 2016 10.0.14393.2551, 2016 10.0.14393.2580, 2016 10.0.14393.2608, 2016 10.0.14393.2639, 2016 10.0.14393.2641, 2016 10.0.14393.2665, 2016 10.0.14393.2670, 2016 10.0.14393.2724, 2016 10.0.14393.2759, 2016 10.0.14393.2791, 2016 10.0.14393.2828, 2016 10.0.14393.2848, 2016 10.0.14393.2879, 2016 10.0.14393.2906, 2016 10.0.14393.2908, 2016 10.0.14393.2941, 2016 10.0.14393.2969, 2016 10.0.14393.2972, 2016 10.0.14393.2999, 2016 10.0.14393.3025, 2016 10.0.14393.3053, 2016 10.0.14393.3056, 2016 10.0.14393.3085, 2016 10.0.14393.3115, 2016 10.0.14393.3144, 2016 10.0.14393.3181, 2016 10.0.14393.3204, 2016 10.0.14393.3206, 2016 10.0.14393.3242, 2016 10.0.14393.3243, 2016 10.0.14393.3274, 2016 10.0.14393.3300, 2016 10.0.14393.3326, 2016 10.0.14393.3384, 2016 10.0.14393.3443, 2016 10.0.14393.3474, 2016 10.0.14393.3504, 2016 10.0.14393.3542, 2016 10.0.14393.3564, 2016 10.0.14393.3595, 2016 10.0.14393.3630, 2016 10.0.14393.3659, 2016 10.0.14393.3686, 2016 10.0.14393.3750, 2016 10.0.14393.3755, 2016 10.0.14393.3808, 2016 10.0.14393.3866, 2016 10.0.14393.3930, 2016 10.0.14393.3986, 2016 10.0.14393.4046, 2016 10.0.14393.4048, 2016 10.0.14393.4104, 2016 10.0.14393.4169, 2016 10.0.14393.4225, 2016 10.0.14393.4283, 2016 10.0.14393.4288, 2016 10.0.14393.4350, 2016 10.0.14393.4402, 2016 10.0.14393.4467, 2016 10.0.14393.4470, 2016 10.0.14393.4530, 2016 10.0.14393.4532, 2016 10.0.14393.4583, 2016 10.0.14393.4651, 2016 10.0.14393.4704, 2016 10.0.14393.4770, 2016 10.0.14393.4771, 2016 10.0.14393.4825, 2016 10.0.14393.4827, 2016 10.0.14393.4886, 2016 10.0.14393.4889, 2016 10.0.14393.4946, 2016 10.0.14393.5006, 2016 10.0.14393.5066, 2016 10.0.14393.5125, 2016 10.0.14393.5127, 2016 10.0.14393.5192, 2016 10.0.14393.5246, 2016 10.0.14393.5291, 2016 10.0.14393.5356, 2016 10.0.14393.5427, 2016 10.0.14393.5429, 2016 10.0.14393.5501, 2016 10.0.14393.5502, 2016 10.0.14393.5582, 2016 10.0.14393.5648, 2016 10.0.14393.5717, 2016 10.0.14393.5786, 2016 10.0.14393.5850, 2016 10.0.14393.5921, 2016 10.0.14393.5989, 2016 10.0.14393.5996, 2016 10.0.14393.6085, 2016 10.0.14393.6167, 2016 10.0.14393.6252, 2016 10.0.14393.6351, 2016 10.0.14393.6452, 2016 10.0.14393.6529, 2016 10.0.14393.6614, 2016 10.0.14393.6709, 2016 10.0.14393.6796, 2016 10.0.14393.6800, 2016 10.0.14393.6897, 2016 10.0.14393.6981, 2016 10.0.14393.7070, 2016 10.0.14393.7159, 2016 10.0.14393.7259, 2016 10.0.14393.7336, 2016 10.0.14393.7428, 2016 10.0.14393.7515, 2016 10.0.14393.7606, 2016 10.0.14393.7699, 2022 10.0.20348.202, 2022 10.0.20348.230, 2022 10.0.20348.261, 2022 10.0.20348.288, 2022 10.0.20348.320, 2022 10.0.20348.350, 2022 10.0.20348.380, 2022 10.0.20348.405, 2022 10.0.20348.407, 2022 10.0.20348.469, 2022 10.0.20348.473, 2022 10.0.20348.502, 2022 10.0.20348.524, 2022 10.0.20348.558, 2022 10.0.20348.587, 2022 10.0.20348.617, 2022 10.0.20348.643, 2022 10.0.20348.681, 2022 10.0.20348.707, 2022 10.0.20348.709, 2022 10.0.20348.740, 2022 10.0.20348.768, 2022 10.0.20348.803, 2022 10.0.20348.825, 2022 10.0.20348.859, 2022 10.0.20348.887, 2022 10.0.20348.946, 2022 10.0.20348.1006, 2022 10.0.20348.1070, 2022 10.0.20348.1129, 2022 10.0.20348.1131, 2022 10.0.20348.1194, 2022 10.0.20348.1249, 2022 10.0.20348.1251, 2022 10.0.20348.1311, 2022 10.0.20348.1366, 2022 10.0.20348.1368, 2022 10.0.20348.1487, 2022 10.0.20348.1547, 2022 10.0.20348.1607, 2022 10.0.20348.1668, 2022 10.0.20348.1726, 2022 10.0.20348.1787, 2022 10.0.20348.1850, 2022 10.0.20348.1906, 2022 10.0.20348.1970, 2022 10.0.20348.2031, 2022 10.0.20348.2113, 2022 10.0.20348.2159, 2022 10.0.20348.2227, 2022 10.0.20348.2322, 2022 10.0.20348.2333, 2022 10.0.20348.2340, 2022 10.0.20348.2342, 2022 10.0.20348.2402, 2022 10.0.20348.2458, 2022 10.0.20348.2461, 2022 10.0.20348.2522, 2022 10.0.20348.2527, 2022 10.0.20348.2582, 2022 10.0.20348.2655, 2022 10.0.20348.2695, 2022 10.0.20348.2700, 2022 10.0.20348.2762, 2022 10.0.20348.2849, 2022 10.0.20348.2908, 2022 10.0.20348.2966, 2022 10.0.20348.3091, 2022 23H2 10.0.25398.887, 2022 23H2 10.0.25398.1009, 2022 23H2 10.0.25398.1128, 2022 23H2 10.0.25398.1189, 2022 23H2 10.0.25398.1251, 2022 23H2 10.0.25398.1308, 2022 23H2 10.0.25398.1369, 2025 10.0.26100.1742, 2025 10.0.26100.2240, 2025 10.0.26100.2314, 2025 10.0.26100.2528, 2025 10.0.26100.2605, 2025 10.0.26100.2894

External links
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21349

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability

Improper Authentication in Microsoft Windows Remote Desktop Configuration Service