No exploitation reportedFix available

CVE-2021-21285

Q: Is CVE-2021-21285 actively exploited?

Active exploitation of CVE-2021-21285 has not been confirmed. Its EPSS score was 3.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-21285?

CVE-2021-21285 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-02-02
Fixed in20.10.3 · 19.03.15 · 19.3.15
WeaknessCWE-400 · CWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Docker before versions 9.03.15, 20.10.3 there is a vulnerability in which pulling an intentionally malformed Docker image manifest crashes the dockerd daemon. Versions 20.10.3 and 19.03.15 contain patches that prevent the daemon from crashing.

Timeline

dates in UTC

2021-02-0218:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-21285?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-21285?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Docker

Branch	Affected	Fixed in	Source
20.x	≥ 20.0.0, < 20.10.3	20.10.3	NVD
20.10	≥ 20.10.0-beta1, < 20.10.3	20.10.3	OSV
19.3	< 19.03.15	19.03.15	NVD
19.3	< 19.3.15	19.3.15	OSV

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD

Netapp e-series santricity os controller

Branch	Affected	Fixed in	Source
11.x	≥ 11.0, ≤ 11.60.3	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Docker to 20.10.3 · 19.03.15 · 19.3.15

Advisories and patches

docs.docker.comRelease Notes · Vendor Advisory
github.comPatch
github.comRelease Notes
github.comRelease Notes
security.gentoo.orgPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.16.5read 2026-10-23
NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
NVDweakness (CWE)CWE-754read 2026-10-23
FIRST EPSSEPSS score3.3 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: 2021-02-02
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-21285?

Is CVE-2021-21285 actively exploited?

Active exploitation of CVE-2021-21285 has not been confirmed. Its EPSS score was 3.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21285?

CVE-2021-21285 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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