What is CVE-2021-20523?

CVE-2021-20523 is a low-severity vulnerability in Docker, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 2.7/10. Published 2021-07-15.

How severe is CVE-2021-20523?

Low severity. CVSS v3 base score is 2.7 out of 10.

Information disclosure in Docker

CVE-2021-20523

IBM Security Verify Access Docker 10.0.0 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system. IBM X-Force ID: 198660

Published 2021-07-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Docker
IBM Security Verify Access — versions 10.0.0
IBM Security Verify Access Docker — versions 10.0.0

Weakness classification (CWE)

CWE-209 — Generation of Error Message Containing Sensitive Information

References

www.ibm.com/support/pages/node/6471895 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/198660 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20523?: CVE-2021-20523 is a low-severity vulnerability in Docker, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 2.7/10. Published 2021-07-15.
How severe is CVE-2021-20523?: Low severity. CVSS v3 base score is 2.7 out of 10.