CVE-2026-7830

UltraVNC through 1.8.2.2 uses inadequate cryptography in the MS-Logon II authentication scheme rfbUltraVNCMsLogonIIAuth. In rfb/dh.cpp the Diffie-Hellman key exchange is performed with parameters that fit in an unsigned 64-bit integer DHMAXBITS controls the prime size. A 64-bit DH key can be brok...

CVE-2026-7830

UltraVNC through 1.8.2.2 uses inadequate cryptography in the MS-Logon II authentication scheme rfbUltraVNCMsLogonIIAuth. In rfb/dh.cpp the Diffie-Hellman key exchange is performed with parameters that fit in an unsigned 64-bit integer DHMAXBITS controls the prime size. A 64-bit DH key can be brok...

PT-2026-54486

Name of the Vulnerable Software and Affected Versions UltraVNC versions prior to 1.8.2.3 Description Inadequate cryptography in the MS-Logon II authentication scheme rfbUltraVNC MsLogonIIAuth allows a network attacker to disclose credentials. In the file rfb/dh.cpp, the Diffie-Hellman key exchang...