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Noroxi
NVD / CVE Program· CNA redhat

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).

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.1% (FIRST EPSS); higher than 66.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: cockpit-podman (AlmaLinux:8) 29-2.module_el8.6.0+2876+9ed4eae2; conmon (AlmaLinux:8) 2:2.0.26-1.module_el8.6.0+2876+9ed4eae2; containernetworking-plugins (AlmaLinux:8) 0.9.1-1.module_el8.6.0+2876+9ed4eae2.

Low priority for now. Upgrade to cockpit-podman (AlmaLinux:8) 29-2.module_el8.6.0+2876+9ed4eae2; conmon (AlmaLinux:8) 2:2.0.26-1.module_el8.6.0+2876+9ed4eae2; containernetworking-plugins (AlmaLinux:8) 0.9.1-1.module_el8.6.0+2876+9ed4eae2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Feb 2, 2021
Updated
Jun 16, 2026
EPSS
1.1% · 66th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-20199

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
podman projectpodman

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • podman project podman1.8.0 and later · before 3.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a podman

    • podman 1.8.0 onwardsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8cockpit-podmanbefore 29-2.module_el8.6.0+2876+9ed4eae229-2.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8conmonbefore 2:2.0.26-1.module_el8.6.0+2876+9ed4eae22:2.0.26-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8containernetworking-pluginsbefore 0.9.1-1.module_el8.6.0+2876+9ed4eae20.9.1-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8critbefore 3.15-1.module_el8.6.0+2876+9ed4eae23.15-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8criubefore 3.15-1.module_el8.6.0+2876+9ed4eae23.15-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8fuse-overlayfsbefore 1.4.0-2.module_el8.6.0+2876+9ed4eae21.4.0-2.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8libslirpbefore 4.3.1-1.module_el8.6.0+2876+9ed4eae24.3.1-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8libslirp-develbefore 4.3.1-1.module_el8.6.0+2876+9ed4eae24.3.1-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8python3-criubefore 3.15-1.module_el8.6.0+2876+9ed4eae23.15-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8slirp4netnsbefore 1.1.8-1.module_el8.6.0+2876+9ed4eae21.1.8-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:8udicabefore 0.2.4-1.module_el8.6.0+2876+9ed4eae20.2.4-1.module_el8.6.0+2876+9ed4eae2
AlmaLinux:9podmanbefore 2:4.2.0-3.el92:4.2.0-3.el9
AlmaLinux:9podman-dockerbefore 2:4.2.0-3.el92:4.2.0-3.el9
AlmaLinux:9podman-gvproxybefore 2:4.2.0-3.el92:4.2.0-3.el9
AlmaLinux:9podman-pluginsbefore 2:4.2.0-3.el92:4.2.0-3.el9
AlmaLinux:9podman-remotebefore 2:4.2.0-3.el92:4.2.0-3.el9
AlmaLinux:9podman-testsbefore 2:4.2.0-3.el92:4.2.0-3.el9
Debian:12libpodbefore 3.0.0~rc2+dfsg1-23.0.0~rc2+dfsg1-2
Debian:12rootlesskitbefore 0.12.0-10.12.0-1
Gogithub.com/containers/podman/v3before 3.0.03.0.0
openSUSE:Leap 15.3conmonbefore 2.0.30-150300.8.3.12.0.30-150300.8.3.1
openSUSE:Leap 15.3libcontainers-commonbefore 20210626-150300.8.3.120210626-150300.8.3.1
openSUSE:Leap 15.3libseccompbefore 2.5.3-150300.10.5.12.5.3-150300.10.5.1
openSUSE:Leap 15.3podmanbefore 3.4.4-150300.9.3.23.4.4-150300.9.3.2

+96

Same product

podman project: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-1227A privilege escalation flaw was found in Podman.
    36Monitor
  • CVE-2026-57231Podman: Malformed Image can trick podman run into leaking host environment variables into the container
    30Monitor
  • CVE-2024-3056Podman: kernel: containers in shared ipc namespace are vulnerable to denial of service attack
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-14370Sep 23, 2020 · An information disclosure vulnerability was found in containers/podman in versions before 2.0.5.
    21Monitor
  • Later →CVE-2021-20188Feb 11, 2021 · A flaw was found in podman before 1.7.0.
    28Monitor
  • Later →CVE-2021-4024Dec 23, 2021 · A flaw was found in podman.
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:cockpit-podman29-2.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:conmon2:2.0.26-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:containernetworking-plugins0.9.1-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:crit3.15-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:criu3.15-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:fuse-overlayfs1.4.0-2.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:libslirp4.3.1-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:libslirp-devel4.3.1-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:podman2:4.2.0-3.el9 · AlmaLinux:9Package registry (OSV)
almalinux:python3-criu3.15-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:slirp4netns1.1.8-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
almalinux:udica0.2.4-1.module_el8.6.0+2876+9ed4eae2 · AlmaLinux:8Package registry (OSV)
debian:libpod3.0.0~rc2+dfsg1-2 · Debian:12Package registry (OSV)
debian:rootlesskit0.12.0-1 · Debian:12Package registry (OSV)
Go:github.com/containers/podman/v33.0.0Package registry (OSV)
opensuse:conmon2.0.30-150300.8.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:libcontainers-common20210626-150300.8.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:libseccomp2.5.3-150300.10.5.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:podman4.3.1-150400.4.11.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
red hat:buildah0:1.19.7-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-debuginfo0:1.19.7-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-debugsource0:1.19.7-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-tests0:1.19.7-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-tests-debuginfo0:1.19.7-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:cockpit-podman0:29-2.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:conmon2:2.0.26-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:conmon-debuginfo2:2.0.26-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:conmon-debugsource2:2.0.26-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:container-selinux2:2.158.0-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:containernetworking-plugins0:0.9.1-1.module+el8.4.0+10607+f4da7515 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)

+18

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-346 · Origin Validation Error

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records