CVE-2021-42785CWE-120

Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59

published November 23, 2021

CVSS
—
EPSS
2%
Percentile
83.5
In the wild
Unconfirmed
What it is

⚠️ A crafty buffer overflow lurks in TightVNC Viewer that could let attackers execute arbitrary code remotely – think of it as a magic trick gone wrong! 🎩 Imagine a delivery driver who opens a package without checking if it’s safe, allowing unwanted surprises to spill out. This vulnerability lets a remote attacker send a specially crafted FramebufferUpdate packet that could trick the application into executing rogue commands. If exploited, an attacker could gain remote control, executing any instruction on your system, leading to potentially devastating consequences! This could mean data breaches or unauthorized access to sensitive information – yikes!

Put simply

Imagine a delivery driver who opens a package without checking if it’s safe, allowing unwanted surprises to spill out. This vulnerability lets a remote attacker send a specially crafted FramebufferUpdate packet that could trick the application into executing rogue commands. The vulnerability arises from improper handling of FramebufferUpdate packets in tvnviewer.exe, allowing attackers to craft malicious packets that overflow the buffer and execute arbitrary code.

What to do

If exploited, an attacker could gain remote control, executing any instruction on your system, leading to potentially devastating consequences! This could mean data breaches or unauthorized access to sensitive information – yikes! To defend against this vulnerability, ensure you are using the latest version of TightVNC Viewer. Regularly check for security patches and consider disabling remote access if it’s not necessary. 🛡️ You've got this! By staying vigilant and updating, you can keep your systems secure and your superhero status intact! 💪✨

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.02342 · 83.5th percentile
Weakness
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Published
2021-11-23T21:37Z
EPSS history
Timeline
  • 23 NOV 21:37Z
    Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
    cvelistv5