Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
CVE-2021-42785

9.8CRITICAL

Key Information:

Vendor

Glavsoft Llc

Status
Tightvnc Viewer
Vendor
CVE Published:
23 November 2021

What is CVE-2021-42785?

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 Version(s)

TightVNC Viewer 2.8.59

References

https://www.tightvnc.com/whatsnew.php
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eugene Lim from Government Technology Agency of Singapore
.