CVE-2026-79680

A flaw was found in the Qt VNC Server module. A remote attacker, by using a specially modified VNC client that violates the Remote Framebuffer RFB protocol, can bypass the password authentication mechanism. This allows the attacker to gain unauthorized remote access to the shared application,...

CVE-2026-79680

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared...

CVE-2026-79680

The Qt VNC Server module contains an authentication bypass vulnerability within its password authentication mechanism. An attacker utilizing a specially modified VNC client that violates the RFB protocol can bypass password requirements to gain unauthorized remote access to the shared application...

CVE-2026-79680 Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared...

CVE-2026-79680 Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared...

EUVD-2026-85846

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared...

PT-2026-97783

Name of the Vulnerable Software and Affected Versions Qt VNC Server affected versions not specified Description An authentication bypass exists in the password authentication mechanism of the Qt VNC Server module. An attacker can use a modified VNC client that violates the RFB Remote Frame Buffer...

CVE-2026-79680: Authentication Bypass Using an Alternate Path or Channel

Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared...

gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb Hextile heap out-of-bounds write with 16bpp framebuffer

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit...

gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb Hextile heap out-of-bounds write with 16bpp framebuffer

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit...

OESA-2026-3319 libvncserver security update

libvncserver is a set of programs using the RFB Remote Frame Buffer protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets which LibVNCServer does, you can also connect using an in-browser VNC...

CVE-2026-41252: Heap-based Buffer Overflow

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a missing bounds check in xrdp, which allows a heap-based buffer overflow when operating in vnc-any mode. The issue occurs during the handling of RFB protocol color map messages from a VNC server, where incoming color indices ar...

CVE-2026-7838 UltraVNC viewer heap buffer overflow via integer overflow in RFB connection-failure reason length

UltraVNC viewer through 1.8.2.2 contains an integer overflow leading to a heap buffer overflow in the RFB protocol failure-response parsing path. In vncviewer/ClientConnection.cpp, the 4-byte network-supplied reasonLen field type CARD32 is passed as reasonLen+1 to CheckBufferSize. Because both...

CVE-2026-7838: Integer Overflow or Wraparound

UltraVNC viewer through 1.8.2.2 contains an integer overflow leading to a heap buffer overflow in the RFB protocol failure-response parsing path. In vncviewer/ClientConnection.cpp, the 4-byte network-supplied reasonLen field type CARD32 is passed as reasonLen+1 to CheckBufferSize. Because both...

MiracleLinux 3 : vnc-4.1.2-9.6AXS3 (AXSA:2009-21:01)

The remote MiracleLinux 3 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2009-21:01 advisory. Virtual Network Computing VNC is a remote display system which allows you to view a computing 'desktop' environment not only on the machine where it is running...

EUVD-2008-4750

Malware in sbrugna...

SUSE CVE-2018-20748

LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete...

SUSE CVE-2020-14399

An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly "no trust boundary crossed...

CVE-2021-41380

RealVNC Viewer 6.21.406 allows remote VNC servers to cause a denial of service application crash via crafted RFB protocol data. NOTE: It is asserted that this issue requires social engineering a user into connecting to a fake VNC Server. The VNC Viewer application they are using will then hang,...

Memory corruption

DISPUTED RealVNC Viewer 6.21.406 allows remote VNC servers to cause a denial of service application crash via crafted RFB protocol data. NOTE: It is asserted that this issue requires social engineering a user into connecting to a fake VNC Server. The VNC Viewer application they are using will the...