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CVE-2026-7831
7.6 HIGH
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CVSS version (CVSS): 3.1
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Attack Vector (AV): Network (N)
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Attack Complexity (AC): Low (L)
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Privileges Required (PR): None (N)
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User Interaction (UI): Required (R)
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Scope (S): Unchanged (U)
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Confidentiality (C): Low (L)
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Integrity (I): Low (L)
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Availability (A): High (H)
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Modified Attack Vector (MAV): Network (N)
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Modified Attack Complexity (MAC): Low (L)
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Modified Privileges Required (MPR): None (N)
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Modified User Interaction (MUI): Required (R)
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Modified Confidentiality (MC): Low (L)
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Modified Scope (MS): Unchanged (U)
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Modified Integrity (MI): Low (L)
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Modified Availability (MA): High (H)
created
2 months, 2 weeks ago
Activity log
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Created & dismissed (no matching packages found) suggestion
2 months, 2 weeks ago
UltraVNC viewer off-by-one stack overflow in ServerInit desktop name parsing
UltraVNC viewer through 1.8.2.2 contains an off-by-one stack buffer overflow in the RFB ServerInit message handler. In vncviewer/ClientConnection.cpp, when the server-supplied nameLength equals exactly 2024 the code declares a 2024-byte stack buffer _dn[2024] and calls ReadString(_dn, 2024). ReadString writes the NUL terminator at buf[length], i.e., _dn[2024], one byte past the end of the stack buffer. A malicious VNC server can trigger this condition by advertising a desktop name of length 2024 in its ServerInit message. On release builds without stack canaries the single-byte NUL overwrite adjacent stack data. On builds with /GS stack protection the canary is corrupted and the process terminates, resulting in denial of service. User interaction (connecting the viewer to the malicious server) is required.