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Fencer Intel
medium 5.9

CVE-2021-20199 json

Podman Origin Validation Error

published 5y ago modified 4mo ago also GHSA-grh6-q6m2-rh72 , EUVD-2021-1086

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/containers/podman/v3 3.0.0
  • podman_project podman 3.0.0
  • libpod Debian 12 3.0.0~rc2+dfsg1-2
  • rootlesskit Debian 14, Debian 13, Debian 12 0.12.0-1

debian advisories DEBIAN-CVE-2021-20199

  • crit RHEL 8 3.15-1.module+el8.4.0+10607+f4da7515
  • criu RHEL 8 3.15-1.module+el8.4.0+10607+f4da7515
  • crun RHEL 8 0.18-1.module+el8.4.0+10607+f4da7515
  • runc RHEL 8 1.0.0-70.rc92.module+el8.4.0+10607+f4da7515
  • udica RHEL 8 0.2.4-1.module+el8.4.0+10607+f4da7515
  • conmon RHEL 8 2:2.0.26-1.module+el8.4.0+10607+f4da7515
  • podman RHEL 8 3.0.1-6.module+el8.4.0+10607+f4da7515
  • skopeo RHEL 8 1:1.2.2-8.module+el8.4.0+10607+f4da7515

red hat advisories RHSA-2021:1796RHSA-2022:7954

  • podman SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 4.3.1-150300.9.15.1
  • podman SLE Module for Containers 15 SP4, SLE Micro 5.3, openSUSE Leap Micro 5.3 +1 more 4.3.1-150400.4.11.1
  • libcontainers-common SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES 15 SP2-LTSS +12 more 20210626-150100.3.15.1
  • podman SLE Module for Containers 15 SP3, SLE Micro 5.1 3.4.4-150300.9.3.2
  • conmon SLE Module for Containers 15 SP3, SLE Micro 5.1 2.0.30-150300.8.3.1
  • libseccomp SLE Module for Basesystem 15 SP3, SLE Micro 5.1 2.5.3-150300.10.5.1
  • libcontainers-common SLE Module for Basesystem 15 SP3, SLE Micro 5.1 20210626-150300.8.3.1

suse advisories SUSE-SU-2023:0326-1SUSE-SU-2023:0187-1SUSE-SU-2022:3312-1SUSE-SU-2022:23018-1

  • podman openSUSE Tumbleweed 3.3.1-2.1
  • libcontainers-common openSUSE Tumbleweed 20210626-7.1
  • podman openSUSE Leap 15.3 3.4.4-150300.9.3.2
  • conmon openSUSE Leap 15.3 2.0.30-150300.8.3.1
  • libseccomp openSUSE Leap 15.3 2.5.3-150300.10.5.1
  • libcontainers-common openSUSE Leap 15.3 20210626-150300.8.3.1

opensuse advisories openSUSE-SU-2024:11177-1openSUSE-SU-2024:11757-1openSUSE-SU-2022:23018-1

  • podman AlmaLinux 9 2:4.2.0-3.el9
  • podman-tests AlmaLinux 9 2:4.2.0-3.el9
  • podman-docker AlmaLinux 9 2:4.2.0-3.el9
  • podman-remote AlmaLinux 9 2:4.2.0-3.el9
  • podman-gvproxy AlmaLinux 9 2:4.2.0-3.el9
  • podman-plugins AlmaLinux 9 2:4.2.0-3.el9
  • crit AlmaLinux 8 3.15-1.module_el8.6.0+2876+9ed4eae2
  • criu AlmaLinux 8 3.15-1.module_el8.6.0+2876+9ed4eae2

almalinux advisories ALSA-2022:7954ALSA-2021:1796

  • criu Rocky Linux 8 3.15-1.module+el8.7.0+1076+9b1c11c1
  • criu Rocky Linux 8 3.15-1.module+el8.4.0+556+40122d08
  • criu Rocky Linux 8 3.15-1.module+el8.5.0+709+440d5e7e
  • criu Rocky Linux 8 3.15-1.module+el8.6.0+783+10209741
  • udica Rocky Linux 8 0.2.4-1.module+el8.7.0+1076+9b1c11c1
  • udica Rocky Linux 8 0.2.4-1.module+el8.4.0+556+40122d08
  • udica Rocky Linux 8 0.2.4-1.module+el8.5.0+709+440d5e7e
  • udica Rocky Linux 8 0.2.4-1.module+el8.6.0+783+10209741

rocky linux advisories RLSA-2021:1796

  • podman Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 3.0.0-r0

alpine advisories ALPINE-CVE-2021-20199

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • podman CBL-Mariner 2.0 4.1.1-1

azure linux advisories AZL-7329

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • podman Arch Linux 3.0.0-1

arch linux advisories AVG-1517

Is CVE-2021-20199 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20199 updated cvss 5.9

podman: Remote traffic to rootless containers is seen as orginating from localhost

  • Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more
    affected: workaround, no fix planned “Configure containerized applications to require authentication for connections from all sources, including localhost.”
  • Red Hat Enterprise Linux AppStream (v. 8) crit 3.15-1.module+el8.4.0+10607+f4da7515, criu 3.15-1.module+el8.4.0+10607+f4da7515, crun 0.18-1.module+el8.4.0+10607+f4da7515, udica 0.2.4-1.module+el8.4.0+10607+f4da7515, podman 3.0.1-6.module+el8.4.0+10607+f4da7515, skopeo 1.2.2-8.module+el8.4.0+10607+f4da7515, +20 more
    fixed: vendor fix “Configure containerized applications to require authentication for connections from all sources, including localhost.” RHSA-2021:1796
  • Red Hat Enterprise Linux AppStream (v. 9) podman 4.2.0-3.el9, podman-tests 4.2.0-3.el9, podman-docker 4.2.0-3.el9, podman-remote 4.2.0-3.el9, podman-gvproxy 4.2.0-3.el9, podman-plugins 4.2.0-3.el9
    fixed: vendor fix “Configure containerized applications to require authentication for connections from all sources, including localhost.” RHSA-2022:7954
  • Red Hat Enterprise Linux 7 podman Red Hat Enterprise Linux 8 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more Red Hat OpenShift Container Platform 3.11 podman
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/containers/podman/issues/5138 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/containers/podman/v3
<3.0.0
3.0.0

Affected products

  • n/a podman

Classification

Weakness
  • CWE-346 Origin Validation Error
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.