CVE-2021-20397

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-05 · updated 2026-06-17
Weakness: CWE-79

Description

IBM QRadar SIEM 7.3 and 7.4 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 196017.

Affected products

IBM QRadar SIEM: from 7.3.0 before 7.3.3; from 7.4.0 before 7.4.2; 7.3.3, 7.3.3-fix_pack_1, 7.3.3-fix_pack_2, 7.3.3-fix_pack_3, 7.3.3-fix_pack_4, 7.3.3-fix_pack_5 (+5) — fixed in 7.3.3, 7.4.2

How to fix

Upgrade to a fixed version: IBM QRadar SIEM 7.3.3, 7.4.2. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/196017
https://www.ibm.com/support/pages/node/6449688
https://exchange.xforce.ibmcloud.com/vulnerabilities/196017
https://www.ibm.com/support/pages/node/6449688

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