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    CVE-2006-2206

    The MS-Logon authentication scheme in UltraVNC (aka Ultr@VNC) 1.0.1 uses weak encryption (XOR) for challenge/response, which allows remote attackers to gain privileges by sniffing and decrypting passwords.

    Published:May 5, 2006
    Last Modified:Apr 16, 2026
    EPS:May 5, 2006
    EPSS Score:0.00775
    CVSS Score:10

    Affected Products

    Vendor
    Ultravnc
    Product
    Ultravnc

    Exploits

    http://www.securityfocus.com/bid/17824http://www.securityfocus.com/bid/17824

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-4962 (CVSS 6.4) — A security flaw has been discovered in UltraVNC up to 1.6.4.0. Affected by this issue is some unknown function…
    CVE-2026-3787 (CVSS 6.4) — A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library…
    CVE-2020-37134 (CVSS 4.6) — UltraVNC Viewer 1.2.4.0 contains a denial of service vulnerability that allows attackers to crash the applicat…
    CVE-2020-37133 (CVSS 6.7) — UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in the Repeater Host configuration field …
    CVE-2020-37132 (CVSS 6.7) — UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in its password configuration properties …
    CVE-2010-5248 (CVSS 6.9) — Untrusted search path vulnerability in UltraVNC 1.0.8.2 allows local users to gain privileges via a Trojan hor…
    CVE-2009-0388 (CVSS 10) — Multiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9 allow remote VNC ser…
    CVE-2008-5001 (CVSS 9.3) — Multiple stack-based buffer overflows in multiple functions in vncviewer/FileTransfer.cpp in vncviewer for Ult…
    CVE-2008-0610 (CVSS 9.3) — Stack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in vncviewer/ClientConn…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High