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MEDIUM severity

CVE-2021-21285 — moby

MEDIUMFix: moby/moby@8d31795

CVE-2021-21285 is a medium-severity (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in github.com/moby/moby. A fix is available for github.com/moby/moby — see the affected versions and patch details below.

moby docker daemon crash during image pull of malicious image

Also known asGHSA-6fj5-m822-rqx8
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
0.00%1.41%2.81%4.22%0.4%3.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/moby/moby🐹github.com/moby/moby

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Pulling an intentionally malformed Docker image manifest crashes the dockerd daemon.

Patches

Versions 20.10.3 and 19.03.15 contain patches that prevent the daemon from crashing.

Credits

Maintainers would like to thank Josh Larsen, Ian Coldwater, Duffie Cooley, Rory McCune for working on the vulnerability and Brad Geesaman for responsibly disclosing it to [email protected].

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/moby/mobyall versions19.3.15go get github.com/moby/moby@v19.3.15
🐹Gogithub.com/moby/moby≥ 20.10.0-beta1&&< 20.10.320.10.3go get github.com/moby/moby@v20.10.3

Affected Products

3 products · 4 configurations
OS
debian linuxdebian
1 version
10.0
Application
dockerdocker
≥ 20.0.0 && < 20.10.3
range
Application
e-series santricity os controllernetapp
≥ 11.0 && ≤ 11.60.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/moby/moby, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/moby/moby to 19.3.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21285 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact Pulling an intentionally malformed Docker image manifest crashes the `dockerd` daemon. ### Patches Versions 20.10.3 and 19.03.15 contain patches that prevent the daemon from crashing. ### Credits Maintainers would like to thank Josh Larsen, Ian Coldwater, Duffie Cooley, Rory McCune for working on the vulnerability and Brad Geesaman for responsibly disclosing it to [email protected].
O3 Security · Impact-Aware SCA

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CVE-2021-21285: moby — Fixed in 19.3.15