CVE-2021-20337

Severity: high (CVSS 7.5 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: 2021-07-26 · updated 2026-06-17
Weakness: CWE-327

Description

IBM QRadar SIEM 7.3.0 to 7.3.3 Patch 8 and 7.4.0 to 7.4.3 GA uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-Force ID: 194448.

Affected products

IBM QRadar SIEM: from 7.3.0 before 7.3.3; from 7.4.0 before 7.4.3; 7.3.3, 7.3.3-p1, 7.3.3-p2, 7.3.3-p3, 7.3.3-p4, 7.3.3-p5 (+7) — fixed in 7.3.3, 7.4.3

How to fix

Upgrade to a fixed version: IBM QRadar SIEM 7.3.3, 7.4.3. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/194448
https://www.ibm.com/support/pages/node/6474847
https://exchange.xforce.ibmcloud.com/vulnerabilities/194448
https://www.ibm.com/support/pages/node/6474847

Get alerted when CVE-2021-20337 or the next vulnerability affects your stack