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No exploitation reportedFix available

CVE-2021-20199

No exploitation reported by the sources we read.

  • Published2021-02-02
  • Fixed in3.0.0
  • WeaknessCWE-346

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-02-0219:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20199?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20199?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Podman project podman
BranchAffectedFixed in
3.0≥ 1.8.0, < 3.0.03.0.0
3.0< 3.0.03.0.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cockpit-podmanAlmaLinux:8all versions · fixed in 29-2.module_el8.6.0+2876+9ed4eae2
  • conmonAlmaLinux:8all versions · fixed in 2:2.0.26-1.module_el8.6.0+2876+9ed4eae2
  • containernetworking-pluginsAlmaLinux:8all versions · fixed in 0.9.1-1.module_el8.6.0+2876+9ed4eae2
  • critAlmaLinux:8all versions · fixed in 3.15-1.module_el8.6.0+2876+9ed4eae2and 2 other packages
  • fuse-overlayfsAlmaLinux:8all versions · fixed in 1.4.0-2.module_el8.6.0+2876+9ed4eae2
  • libslirpAlmaLinux:8all versions · fixed in 4.3.1-1.module_el8.6.0+2876+9ed4eae2and 1 other package
  • podmanAlmaLinux:9all versions · fixed in 2:4.2.0-3.el9and 5 other packages
  • slirp4netnsAlmaLinux:8all versions · fixed in 1.1.8-1.module_el8.6.0+2876+9ed4eae2

1 more package range on OSV.dev

Vendor advisories

  • CVE-2021-20199 Red Hat Product Security267 products fixed · 9 known affected

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

    podman as a component of Red Hat OpenShift Container Platform 4 · podman-catatonit as a component of Red Hat OpenShift Container Platform 4 · podman-docker as a component of Red Hat OpenShift Container Platform 4 · +6 more

  • RHSA-2022:7954 Red Hat Product Security46 products fixed

    Red Hat Security Advisory: podman security and bug fix update

  • RHSA-2021:1796 Red Hat Product Security221 products fixed

    Red Hat Security Advisory: container-tools:rhel8 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Podman project podman to 3.0.0
  2. Vendor fix Red Hat Product Security RHSA-2022:7954 · 46 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Workaround from the vendor Red Hat Product Security RHSA-2022:7954 · 46 productsConfigure containerized applications to require authentication for connections from all sources, including localhost.
  4. No fix planned, says the vendor Red Hat Product Security CVE-2021-20199 · 9 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.15.9read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-346read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2021-02-02
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is 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). 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.

Is CVE-2021-20199 actively exploited?

Active exploitation of CVE-2021-20199 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-20199?

CVE-2021-20199 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

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