medium
6.5
CWE
754 400 20
Advisory Published
Advisory Published
Updated

CVE-2021-21285: Input Validation

First published: Tue Feb 02 2021(Updated: )

### 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 security@docker.com.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Docker Docker<19.03.15
Docker Docker>=20.0.0<20.10.3
Debian Debian Linux=10.0
NetApp E-Series SANtricity OS Controller>=11.0<=11.60.3
debian/docker.io
18.09.1+dfsg1-7.1+deb10u3
20.10.5+dfsg1-1+deb11u2
20.10.24+dfsg1-1
20.10.25+dfsg1-2
IBM Security Guardium<=10.5
IBM Security Guardium<=10.6
IBM Security Guardium<=11.0
IBM Security Guardium<=11.1
IBM Security Guardium<=11.2
IBM Security Guardium<=11.3
go/github.com/moby/moby>=20.10.0-beta1<20.10.3
20.10.3
go/github.com/moby/moby<19.3.15
19.3.15

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-21285?

    CVE-2021-21285 is a vulnerability in Docker that allows a remote attacker to cause a denial of service by crashing the dockerd daemon.

  • How does CVE-2021-21285 work?

    CVE-2021-21285 is caused by improper input validation in Docker. By tricking a victim into pulling a specially-crafted Docker image, the attacker can crash the dockerd daemon and cause a denial of service.

  • Which versions of Docker are affected by CVE-2021-21285?

    Docker versions up to and excluding 19.03.15 and versions between 20.0.0 and 20.10.3 are affected by CVE-2021-21285.

  • How severe is CVE-2021-21285?

    CVE-2021-21285 has a severity rating of 6.5, which is considered medium.

  • How can I fix CVE-2021-21285?

    To fix CVE-2021-21285, update Docker to version 19.03.15 or higher if using a version prior to 20. And update to version 20.10.3 or higher if using a version between 20.0.0 and 20.10.3.

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