CVE-2021-20199

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-02-02 · updated 2026-06-17
Weakness: CWE-346

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.

Affected products

podman: from 1.8.0 before 3.0.0 — fixed in 3.0.0

How to fix

Upgrade to a fixed version: podman 3.0.0. Check the vendor advisory for mitigations.

References

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

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