CVE-2021-42785

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-120

Affected software

Vendor	Product	Versions
GlavSoft LLC	TightVNC Viewer	>= 2.8.59, <= 2.8.59

References

https://www.tightvnc.com/whatsnew.phpRelease Notes, Vendor Advisory
https://www.tightvnc.com/whatsnew.phpRelease Notes, Vendor Advisory

Timeline

Published: Nov 23, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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