CVE-2021-42785: Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
Published Nov 23, 2021
·Updated
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 Software
1 affected component
TightVNC TightVnc<=2.8.59
Event History
Nov 23, 2021
CVE Published
via MITRE·09:37 PM
Data Sourced
via MITRE·09:37 PM
DescriptionWeakness
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is CVE-2021-42785?
CVE-2021-42785 is a buffer overflow vulnerability in tvnviewer.exe of TightVNC Viewer.
2
How does CVE-2021-42785 affect TightVNC Viewer?
CVE-2021-42785 allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.
3
What is the severity of CVE-2021-42785?
CVE-2021-42785 has a severity rating of 9.8, which is considered critical.
4
Which version of TightVNC Viewer is affected by CVE-2021-42785?
TightVNC Viewer version 2.8.59 is affected by CVE-2021-42785.
5
How can I fix CVE-2021-42785?
To fix CVE-2021-42785, update TightVNC Viewer to a version that is not affected by the vulnerability.