What is CVE-2021-20429?

CVE-2021-20429 is a medium-severity vulnerability in IBM Qradar Siem, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2021-05-14.

How severe is CVE-2021-20429?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in IBM Qradar Siem

CVE-2021-20429

IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 could disclose sensitive information due an overly permissive cross-domain policy. IBM X-Force ID: 196334.

Vulnerability class: Broken Access Control

Published 2021-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

IBM Qradar Siem — versions 1.0.0, 4.1.1
IBM Qradar User Behavior Analytics

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.ibm.com/support/pages/node/6453107 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/196334 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20429?: CVE-2021-20429 is a medium-severity vulnerability in IBM Qradar Siem, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2021-05-14.
How severe is CVE-2021-20429?: Medium severity. CVSS v3 base score is 5.3 out of 10.