What is CVE-2020-4271?

CVE-2020-4271 is a medium-severity vulnerability in IBM Qradar, classified under Deserialization of Untrusted Data. CVSS score: 6.3/10. Published 2020-04-15.

How severe is CVE-2020-4271?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Deserialization in IBM Qradar

CVE-2020-4271

IBM QRadar 7.3.0 to 7.3.3 Patch 2 could allow an authenticated user to send a specially crafted command which would be executed as a lower privileged user. IBM X-ForceID: 175897.

Vulnerability class: Insecure Deserialization

Published 2020-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.017 (77.3th percentile), scored 2026-10-21.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

IBM Qradar — versions 7.3.3.Patch2, 7.3.0
IBM Qradar Security Information And Event Manager — versions 7.3.3
Linux Kernel

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.ibm.com/support/pages/node/6189651 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/175897 (VDB Entry, vdb-entry, Vendor Advisory)
seclists.org/fulldisclosure/2020/Apr/39 (mailing-list, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/157336/QRadar-Community-Edition-7.3.1.6-PHP-Objec… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-4271?: CVE-2020-4271 is a medium-severity vulnerability in IBM Qradar, classified under Deserialization of Untrusted Data. CVSS score: 6.3/10. Published 2020-04-15.
How severe is CVE-2020-4271?: Medium severity. CVSS v3 base score is 6.3 out of 10.