What is CVE-2021-20427?

CVE-2021-20427 is a high-severity vulnerability in IBM Security Guardium, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2021-08-11.

How severe is CVE-2021-20427?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in IBM Security Guardium

CVE-2021-20427

IBM Security Guardium 11.2 uses an inadequate account lockout setting that could allow a remote attacker to brute force account credentials. IBM X-Force ID: 196314.

Published 2021-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

IBM Security Guardium — versions 11.2
IBM Security Guardium — versions 11.2
Linux Kernel

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

www.ibm.com/support/pages/node/6479913 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/196314 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20427?: CVE-2021-20427 is a high-severity vulnerability in IBM Security Guardium, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2021-08-11.
How severe is CVE-2021-20427?: High severity. CVSS v3 base score is 7.5 out of 10.