CVSS 3.1
6.8 mediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:NCVE-2021-21284
Medium (6.8). EPSS 1.1% chance of exploitation in the next 30 days. Fixed in github.com/moby/moby 19.3.15, 20.10.3.
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/<remapping>" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
- CWE
- CWE-22
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- docker:docker
- netapp:e-series_santricity_os_controller
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-7452-xqpj-6rpc | Go | github.com/moby/moby | <19.3.15 | 19.3.15 |
| GHSA-7452-xqpj-6rpc | Go | github.com/moby/moby | >=20.10.0-beta1 <20.10.3 | 20.10.3 |