What is CVE-2021-20337?

CVE-2021-20337 is a high-severity vulnerability in IBM Qradar Security Information And Event Manager, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2021-07-26.

How severe is CVE-2021-20337?

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

Vulnerability in IBM Qradar Security Information And Event Manager

CVE-2021-20337

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.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2021-07-26 · 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: 0.007 (51.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

IBM Qradar Security Information And Event Manager — versions 7.3.3, 7.4.3
IBM Qradar Siem — versions 7.3.0, 7.4.0, 7.4.3
Linux Kernel

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

www.ibm.com/support/pages/node/6474847 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/194448 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20337?: CVE-2021-20337 is a high-severity vulnerability in IBM Qradar Security Information And Event Manager, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2021-07-26.
How severe is CVE-2021-20337?: High severity. CVSS v3 base score is 7.5 out of 10.