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UltraVNC UltraVNC RepeaterUltraVNC repeater HTTP server global buffer overflow via long URI (pre-auth RCE)

Risk 86
Severity
9.3
First published (updated )
CVE-2026-7840

UltraVNC UltraVNC RepeaterUltraVNC repeater ships hardcoded default admin password allowing unauthenticated admin access

Risk 66
Severity
9.1
First published (updated )
CVE-2026-7839

UltraVNC UltraVNC ViewerUltraVNC viewer heap buffer overflow via integer overflow in RFB connection-failure reason length

Risk 77
Severity
8.7
First published (updated )
CVE-2026-7838

UltraVNC viewerUltraVNC viewer off-by-one stack overflow in ServerInit desktop name parsing

Risk 57
Severity
7.6
First published (updated )
CVE-2026-7831

UltraVNCUltraVNC MS-Logon II uses 64-bit Diffie-Hellman and seeded libc rand() enabling credential interception

Risk 56
Severity
7.4
First published (updated )
CVE-2026-7830
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UltraVNC UltraVNC RepeaterUltraVNC repeater authenticated out-of-bounds write in rule parser via oversized token

Risk 66
Severity
7.2
First published (updated )
CVE-2026-7829

UltraVNC UltraVNC RepeaterUltraVNC repeater integer overflow in win_log malloc leading to heap overflow

Risk 27
Severity
5.3
First published (updated )
CVE-2026-7828

UltraVNC UltraVNCUltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes

Risk 40
Severity
6.5
First published (updated )
CVE-2026-44040

UltraVNC UltraVNCUltraVNC vncWc2Mb calls wcslen() before validating that the wide string is NUL-terminated

Risk 40
Severity
6.5
First published (updated )
CVE-2026-44041

UltraVNC RepeaterUltraVNC repeater wi_uudecode off-by-one in base64 decode boundary check

Risk 20
Severity
3.7
First published (updated )
CVE-2026-44042
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UltraVNC UltraVNCUltraVNC Service version.dll uncontrolled search path

Risk 49
Severity
6.4
EPSS
0.01%
First published (updated )
CVE-2026-4962

PCHelpWareV2PCHelpWareV2 1.0.0.5 Denial of Service via Group Field

Risk 36
Severity
6.8
First published (updated )
CVE-2019-25564

PCHelpWareV2 PCHelpWareV2PCHelpWareV2 1.0.0.5 Denial of Service via SC Creation

Risk 38
Severity
6.9
First published (updated )
CVE-2019-25563

UltraVNC UltraVNCUltraVNC Windows Service cryptbase.dll uncontrolled search path

Risk 49
Severity
7.3
EPSS
0.01%
First published (updated )
CVE-2026-3787

UltraVNC UltraVNC LauncherUltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service

Risk 43
Severity
7.5
First published (updated )
CVE-2020-37133
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UltraVNC UltraVNC LauncherUltraVNC Launcher 1.2.4.0 - 'Password' Denial of Service

Risk 37
Severity
6.7
First published (updated )
CVE-2020-37132

Uvnc UltravncLow privilege user is able to exploit the service and gain SYSTEM privileges in UltraVNC server

Risk 72
Severity
8.8
First published (updated )
CVE-2022-24750

Uvnc UltravncUltraVNC revision 1211 contains multiple memory leaks (CWE-665) in VNC server code, which allows an …

Risk 45
Severity
7.5
First published (updated )
CVE-2019-8277

Uvnc UltravncUltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an a…

Risk 45
Severity
7.5
First published (updated )
CVE-2019-8259

Uvnc UltravncUltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC client RRE decoder code, caused…

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8260
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Uvnc UltravncBuffer Overflow

Risk 38
Severity
6.5
First published (updated )
CVE-2019-8263

Uvnc UltravncUltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE decode…

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8261

Uvnc UltravncUltraVNC revision 1198 has a buffer underflow vulnerability in VNC client code, which can potentiall…

Risk 86
Severity
9.8
First published (updated )
CVE-2018-15361

Uvnc UltravncBuffer Overflow

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8262

Uvnc UltravncBuffer Overflow

Risk 86
Severity
9.8
First published (updated )
CVE-2019-8258
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Uvnc UltravncUltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, w…

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8264

Uvnc UltravncBuffer Overflow

Risk 86
Severity
9.8
First published (updated )
CVE-2019-8271

Uvnc UltravncUltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside RAW decoder, whic…

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8280

Uvnc UltravncUltraVNC revision 1211 has multiple improper null termination vulnerabilities in VNC server code, wh…

Risk 88
Severity
9.8
First published (updated )
CVE-2019-8275

Uvnc UltravncUltraVNC revision 1207 has out-of-bounds read vulnerability in VNC client code inside TextChat modul…

Risk 43
Severity
7.5
First published (updated )
CVE-2019-8267
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