CVE-2021-42785

—

CVSS 3.1

9.8 critical

EPSS

2%p82

Published

Nov 23, 2021 (Nov 23, 2021)

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.

Vendors: tightvnc
Products: tightvnc
Weakness: CWE-120
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (2.3%)

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