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CVE-2026-107613— NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization

Quick assessment

Affected
GlavSoft TightVNC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GlavSoft TightVNC Server for Windows 在 2.8.88 版本之前的 Win8ScreenDriver 组件中存在空指针解引用漏洞，攻击者可利用该漏洞导致服务器崩溃，从而引发拒绝服务（DoS）攻击。当在 applyNewScreenProperties() 函数中重新初始化 DXGI 桌面复制驱动失败时（例如在 GPU 重置、显示器热插拔或会话更改之后），m_drvImpl 会被置为 NULL，随后在未进行检查的情况下，executeDetection()、getScreenBuf

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
GlavSoft TightVNC < 2.8.88 affected
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I. Basic Information for CVE-2026-107613

Vulnerability Information
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Vulnerability Title
NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GlavSoft TightVNC 0 ~ 2.8.88 -

II. Public POCs for CVE-2026-107613

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III. Intelligence Information for CVE-2026-107613

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Vendor Pages for CVE-2026-107613 (1)

Same Patch Batch · GlavSoft · 2026-10-08 · 5 CVEs total

CVE-2026-107612 7.8 HIGH World-accessible IPC shared memory with predictable name in TightVNC Server
CVE-2026-107615 7.8 HIGH DLL search order hijacking via screenhooks libraries in TightVNC Server
CVE-2026-107611 7.1 HIGH Out-of-bounds read in TightVNC Viewer ZRLE palette decoding
CVE-2026-107614 6.1 MEDIUM Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read

IV. Related Vulnerabilities

Same product: TightVNC
Same vendor: GlavSoft
Same weakness: CWE-476

V. Comments for CVE-2026-107613

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