What’s Vulnerable › Vulnerabilities
CVE-2021-42785: Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-11-23 · updated 2026-06-17
- Weakness: CWE-120
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.
Affected products
- Kaspersky TightVNC: through 2.8.59
References
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