VULNERABILITY INTELLIGENCE

CVE-2021-42785

CVSS score9.8 CRITICAL
EPSS probability2.34%
CISA KEVNot currently listed
Published2021-11-23
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • cve_disclosure@tech.gov.sg: CWE-120
  • nvd@nist.gov: CWE-120

Primary references