ALPINE-CVE-2021-21284

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Source
https://security.alpinelinux.org/vuln/CVE-2021-21284
Import Source
https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json
JSON Data
https://api.osv.dev/v1/vulns/ALPINE-CVE-2021-21284
Upstream
Published
2021-02-02T18:15:11Z
Modified
2026-11-03T06:32:27Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using "--userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.

References

Affected packages

Alpine:v3.12
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.13
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.14
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.15
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.16
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.17
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.18
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.19
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.20
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.21
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.22
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.23
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"
Alpine:v3.24
docker

Package

Name
docker
Purl
pkg:apk/alpine/docker?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
20.0.0
Fixed
20.10.3-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21284.json"