GlavSoft TightVNC up to 2.8.87 Win8ScreenDriver null pointer dereference

Summaryinfo

A vulnerability identified as problematic has been detected in GlavSoft TightVNC up to 2.8.87. Affected is the function applyNewScreenProperties/executeDetection/getScreenBuffer/grabFb/getScreenPropertiesChanged/getCursorPosition of the component Win8ScreenDriver. The manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2026-107613. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in GlavSoft TightVNC up to 2.8.87. It has been rated as problematic. This issue affects the function applyNewScreenProperties/executeDetection/getScreenBuffer/grabFb/getScreenPropertiesChanged/getCursorPosition of the component Win8ScreenDriver. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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().

It is possible to read the advisory at sourceforge.net. The identification of this vulnerability is CVE-2026-107613 since 10/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.8.88 eliminates this vulnerability.

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Productinfo

Vendor

• GlavSoft

Name

• TightVNC

Version

• 2.8.0
• 2.8.1
• 2.8.2
• 2.8.3
• 2.8.4
• 2.8.5
• 2.8.6
• 2.8.7
• 2.8.8
• 2.8.9
• 2.8.10
• 2.8.11
• 2.8.12
• 2.8.13
• 2.8.14
• 2.8.15
• 2.8.16
• 2.8.17
• 2.8.18
• 2.8.19
• 2.8.20
• 2.8.21
• 2.8.22
• 2.8.23
• 2.8.24
• 2.8.25
• 2.8.26
• 2.8.27
• 2.8.28
• 2.8.29
• 2.8.30
• 2.8.31
• 2.8.32
• 2.8.33
• 2.8.34
• 2.8.35
• 2.8.36
• 2.8.37
• 2.8.38
• 2.8.39
• 2.8.40
• 2.8.41
• 2.8.42
• 2.8.43
• 2.8.44
• 2.8.45
• 2.8.46
• 2.8.47
• 2.8.48
• 2.8.49
• 2.8.50
• 2.8.51
• 2.8.52
• 2.8.53
• 2.8.54
• 2.8.55
• 2.8.56
• 2.8.57
• 2.8.58
• 2.8.59
• 2.8.60
• 2.8.61
• 2.8.62
• 2.8.63
• 2.8.64
• 2.8.65
• 2.8.66
• 2.8.67
• 2.8.68
• 2.8.69
• 2.8.70
• 2.8.71
• 2.8.72
• 2.8.73
• 2.8.74
• 2.8.75
• 2.8.76
• 2.8.77
• 2.8.78
• 2.8.79
• 2.8.80
• 2.8.81
• 2.8.82
• 2.8.83
• 2.8.84
• 2.8.85
• 2.8.86
• 2.8.87

CPE 2.3info

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CPE 2.2info

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