CVE-2026-107612
HIGH
7,8
Source: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.
338
Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
DraftCommon Consequences
Security Scopes Affected:
Access Control
Potential Impacts:
Bypass Protection Mechanism
Applicable Platforms
All platforms may be affected
732
Incorrect Permission Assignment for Critical Resource
DraftCommon Consequences
Security Scopes Affected:
Confidentiality
Access Control
Integrity
Other
Potential Impacts:
Read Application Data
Read Files Or Directories
Gain Privileges Or Assume Identity
Modify Application Data
Other
Applicable Platforms
Technologies:
Not Technology-Specific, Cloud Computing
https://sourceforge.net/p/vnc-tight/bugs/1658/
https://www.tightvnc.com/whatsnew.php