EUVD-2026-94976
GHSA-95xq-4x4f-23hr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated low-privileged user (AV:L/PR:L), NULL-DACL mapping with easily predictable name keeps AC:L, and tampering with a SYSTEM service's IPC yields full C:H/I:H/A:H.
Primary rating from Vendor (securin).
CVSS VectorVendor: securin
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Local privilege escalation in TightVNC Server for Windows before 2.8.88 allows an authenticated low-privileged user to tamper with the service's IPC channel, potentially gaining SYSTEM-level access, disclosing session data, or causing denial of service. The flaw stems from a named shared memory segment in the Global\ namespace created with a NULL DACL and a predictable time-seeded name, enabling any local process to open and modify pipe HANDLE values used between the TightVNC service and its desktop server process. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
No credit card · 7-day full trial
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an existing local authenticated session on a Windows host actively running TightVNC Server (versions before 2.8.88) with the service operating as SYSTEM. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N - a local attack requiring low privileges but yielding full confidentiality, integrity, and availability impact (C:H/I:H/A:H) against a SYSTEM-level service, which is the classic profile of a local privilege-escalation flaw (CWE-732, incorrect permission assignment). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch by upgrading TightVNC Server to version 2.8.88 or later, which corrects the permission assignment on the named shared-memory segment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running TightVNC Server for Windows and verify their versions; prioritize patching any version below 2.8.88 by applying the vendor-released update to 2.8.88. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Unauthenticated remote code execution in SmarterTools SmarterMail lets an attacker upload arbitrary files to any locatio
Windows Win32k fails to properly handle objects in memory, allowing local privilege escalation exploited in the wild in
A privilege escalation vulnerability (CVSS 5.5). Risk factors: actively exploited (KEV-listed), EPSS 94% exploitation pr
Windows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Windows SMB contains an improper access control vulnerability (CVE-2025-33073, CVSS 8.8) enabling authenticated attacker
Twonky Server 8.5.2 on Linux and Windows allows unauthenticated access to the admin log file through a web service API b
An unrestricted file upload vulnerability exists in MiniWeb HTTP Server <= Build 300 that allows unauthenticated remote
FreeFloat FTP Server contains multiple critical design flaws that allow unauthenticated remote attackers to upload arbit
Serviio Media Server versions 1.4 through 1.8 on Windows contain an unauthenticated command injection in the /rest/actio
Twonky Server 8.5.2 uses hard-coded cryptographic keys for encrypting the administrator password. Combined with the cred
Mako Server versions 2.5 and 2.6 contain an unauthenticated OS command injection via the tutorial interface at examples/
React Native Metro Development Server binds to external interfaces by default and contains an OS command injection endpo
Same technique Privilege Escalation
View allShare
External POC / Exploit Code
Leaving vuln.today