CVE-2021-42785: Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
First published: Tue 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.
Credit: cve_disclosure@tech.gov.sg cve_disclosure@tech.gov.sg
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Tightvnc Tightvnc | <=2.8.59 | |
| <=2.8.59 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-42785?
CVE-2021-42785 is a buffer overflow vulnerability in tvnviewer.exe of TightVNC Viewer.
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.
What is the severity of CVE-2021-42785?
CVE-2021-42785 has a severity rating of 9.8, which is considered critical.
Which version of TightVNC Viewer is affected by CVE-2021-42785?
TightVNC Viewer version 2.8.59 is affected by CVE-2021-42785.
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.
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