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NVD / CVE Program· CNA redhat

CVE-2021-20188: A flaw was found in podman before 1.7.0.

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.26% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: buildah (AlmaLinux:8) 1.5-8.gite94b4f9.module_el8.4.0+2496+12421f43, 1.5-8.gite94b4f9.module_el8.3.0+2044+12421f43, 1.5-8.gite94b4f9.module_el8.5.0+119+9a9ec082; cockpit-podman (AlmaLinux:8) 11-1.module_el8.5.0+2635+e4386a39, 11-1.module_el8.5.0+108+00865455; conmon (AlmaLinux:8) 2:2.0.15-1.module_el8.5.0+108+00865455, 2:2.0.15-1.module_el8.5.0+2635+e4386a39.

Low priority for now. Upgrade to buildah (AlmaLinux:8) 1.5-8.gite94b4f9.module_el8.4.0+2496+12421f43, 1.5-8.gite94b4f9.module_el8.3.0+2044+12421f43, 1.5-8.gite94b4f9.module_el8.5.0+119+9a9ec082; cockpit-podman (AlmaLinux:8) 11-1.module_el8.5.0+2635+e4386a39, 11-1.module_el8.5.0+108+00865455; conmon (AlmaLinux:8) 2:2.0.15-1.module_el8.5.0+108+00865455, 2:2.0.15-1.module_el8.5.0+2635+e4386a39 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

A flaw was found in podman before 1.7.0. File permissions for non-root users running in a privileged container are not correctly checked. This flaw can be abused by a low-privileged user inside the container to access any other file in the container, even if owned by the root user inside the container. It does not allow to directly escape the container, though being a privileged container means that a lot of security features are disabled when running the container. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Feb 11, 2021
Updated
Jun 16, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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

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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
redhatopenshift container platform
redhatenterprise linux

Affected versions

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

  • podman project podmanbefore 1.7.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat openshift container platform3.11

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 1.7.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8buildahbefore 1.5-8.gite94b4f9.module_el8.4.0+2496+12421f431.5-8.gite94b4f9.module_el8.4.0+2496+12421f43
AlmaLinux:8buildahbefore 1.5-8.gite94b4f9.module_el8.3.0+2044+12421f431.5-8.gite94b4f9.module_el8.3.0+2044+12421f43
AlmaLinux:8buildahbefore 1.5-8.gite94b4f9.module_el8.5.0+119+9a9ec0821.5-8.gite94b4f9.module_el8.5.0+119+9a9ec082
AlmaLinux:8cockpit-podmanbefore 11-1.module_el8.5.0+2635+e4386a3911-1.module_el8.5.0+2635+e4386a39
AlmaLinux:8cockpit-podmanbefore 11-1.module_el8.5.0+108+0086545511-1.module_el8.5.0+108+00865455
AlmaLinux:8conmonbefore 2:2.0.15-1.module_el8.5.0+108+008654552:2.0.15-1.module_el8.5.0+108+00865455
AlmaLinux:8conmonbefore 2:2.0.15-1.module_el8.5.0+2635+e4386a392:2.0.15-1.module_el8.5.0+2635+e4386a39
AlmaLinux:8container-selinuxbefore 2:2.130.0-1.module_el8.5.0+2635+e4386a392:2.130.0-1.module_el8.5.0+2635+e4386a39
AlmaLinux:8container-selinuxbefore 2:2.124.0-1.gitf958d0c.module_el8.3.0+2044+12421f432:2.124.0-1.gitf958d0c.module_el8.3.0+2044+12421f43
AlmaLinux:8container-selinuxbefore 2:2.130.0-1.module_el8.5.0+108+008654552:2.130.0-1.module_el8.5.0+108+00865455
AlmaLinux:8containernetworking-pluginsbefore 0.7.4-4.git9ebe139.module_el8.3.0+2044+12421f430.7.4-4.git9ebe139.module_el8.3.0+2044+12421f43
AlmaLinux:8containernetworking-pluginsbefore 0.7.4-4.git9ebe139.module_el8.5.0+119+9a9ec0820.7.4-4.git9ebe139.module_el8.5.0+119+9a9ec082
AlmaLinux:8containernetworking-pluginsbefore 0.7.4-4.git9ebe139.module_el8.4.0+2496+12421f430.7.4-4.git9ebe139.module_el8.4.0+2496+12421f43
AlmaLinux:8containernetworking-pluginsbefore 0.8.3-4.module_el8.5.0+108+008654550.8.3-4.module_el8.5.0+108+00865455
AlmaLinux:8containernetworking-pluginsbefore 0.8.3-4.module_el8.5.0+2635+e4386a390.8.3-4.module_el8.5.0+2635+e4386a39
AlmaLinux:8containers-commonbefore 1:0.1.32-6.git1715c90.module_el8.4.0+2496+12421f431:0.1.32-6.git1715c90.module_el8.4.0+2496+12421f43
AlmaLinux:8containers-commonbefore 1:0.1.41-4.module_el8.5.0+108+008654551:0.1.41-4.module_el8.5.0+108+00865455
AlmaLinux:8containers-commonbefore 1:0.1.32-6.git1715c90.module_el8.5.0+119+9a9ec0821:0.1.32-6.git1715c90.module_el8.5.0+119+9a9ec082
AlmaLinux:8containers-commonbefore 1:0.1.32-6.git1715c90.module_el8.4.0+2478+12421f431:0.1.32-6.git1715c90.module_el8.4.0+2478+12421f43
AlmaLinux:8containers-commonbefore 1:0.1.41-4.module_el8.5.0+2635+e4386a391:0.1.41-4.module_el8.5.0+2635+e4386a39
AlmaLinux:8critbefore 3.12-9.module_el8.4.0+2496+12421f433.12-9.module_el8.4.0+2496+12421f43
AlmaLinux:8critbefore 3.12-9.module_el8.3.0+2044+12421f433.12-9.module_el8.3.0+2044+12421f43
AlmaLinux:8critbefore 3.12-9.module_el8.5.0+119+9a9ec0823.12-9.module_el8.5.0+119+9a9ec082
AlmaLinux:8criubefore 3.12-9.module_el8.4.0+2496+12421f433.12-9.module_el8.4.0+2496+12421f43

+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
  • ← EarlierCVE-2021-20199Feb 2, 2021 · Rootless containers run with Podman, receive all traffic with a source IP address of 127.0.0.1 (including from remote hosts).
    23Monitor
  • 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:buildah1.5-8.gite94b4f9.module_el8.5.0+119+9a9ec082 · AlmaLinux:8Package registry (OSV)
almalinux:container-selinux2:2.124.0-1.gitf958d0c.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:containernetworking-plugins0.7.4-4.git9ebe139.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:containers-common1:0.1.32-6.git1715c90.module_el8.4.0+2478+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:crit3.12-9.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:criu3.12-9.module_el8.4.0+2496+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:fuse-overlayfs0.3-5.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:oci-systemd-hook1:0.1.15-2.git2d0b8a3.module_el8.5.0+119+9a9ec082 · AlmaLinux:8Package registry (OSV)
almalinux:oci-umount2:2.3.4-2.git87f9237.module_el8.5.0+119+9a9ec082 · AlmaLinux:8Package registry (OSV)
almalinux:podman1.0.0-8.git921f98f.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:podman-docker1.0.0-8.git921f98f.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:python-podman-api1.2.0-0.2.gitd0a45fe.module_el8.5.0+2635+e4386a39 · AlmaLinux:8Package registry (OSV)
almalinux:python3-criu3.12-9.module_el8.3.0+2044+12421f43 · AlmaLinux:8Package registry (OSV)
almalinux:runc1.0.0-66.rc10.module_el8.5.0+2635+e4386a39 · AlmaLinux:8Package registry (OSV)
almalinux:toolbox0.0.7-1.module_el8.5.0+108+00865455 · AlmaLinux:8Package registry (OSV)
almalinux:udica0.2.1-2.module_el8.5.0+108+00865455 · AlmaLinux:8Package registry (OSV)
debian:libpod2.0.2+dfsg1-3 · Debian:12Package registry (OSV)
Go:github.com/containers/libpod1.7.0Package registry (OSV)
red hat:buildah0:1.14.9-1.module+el8.2.1+6689+748e6520 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-debuginfo0:1.14.9-1.module+el8.2.1+6689+748e6520 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-debugsource0:1.14.9-1.module+el8.2.1+6689+748e6520 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-tests0:1.14.9-1.module+el8.2.1+6689+748e6520 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:buildah-tests-debuginfo0:1.14.9-1.module+el8.2.1+6689+748e6520 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:cockpit-podman0:17-1.module+el8.2.1+6636+bf4db4ab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:conmon2:2.0.17-1.module+el8.2.1+6771+3533eb4c · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:container-selinux2:2.135.0-1.module+el8.2.1+6849+893e4f4a · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:containernetworking-plugins0:0.8.6-1.module+el8.2.1+6626+598993b4 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:containernetworking-plugins-debuginfo0:0.8.6-1.module+el8.2.1+6626+598993b4 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:containernetworking-plugins-debugsource0:0.8.6-1.module+el8.2.1+6626+598993b4 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:containers-common1:1.0.0-1.module+el8.2.1+6676+604e1b26 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)

+12

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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

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

All records