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7.5

TigerVNC can be crashed by long usernames

CVE-2017-7394 · published 9 years ago
Summary

The TigerVNC remote desktop server (version 1.7.1) can be forced to stop working if an unauthenticated user sends an overly long username. This could interrupt remote access services and require a restart. Apply the vendor's update or limit username length to prevent the crash.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
tigervnc tigervnc 1.7.1
cpe:2.3:a:tigervnc:tigervnc:1.7.1:*:*:*:*:*:*:*
Original advisory text
In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.
In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
2% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published1 Apr 2017
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2017-7394 · NVD
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