What is CVE-2020-4338?

CVE-2020-4338 is a medium-severity vulnerability in IBM Mq, classified under Information Disclosure. CVSS score: 5.5/10. Published 2020-04-16.

How severe is CVE-2020-4338?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in IBM Mq

CVE-2020-4338

IBM MQ 9.1.4 could allow a local attacker to obtain sensitive information by inclusion of sensitive data within runmqras data. IBM X-Force ID: 177937.

Vulnerability class: Information Disclosure

Published 2020-04-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

IBM Mq — versions 9.1.4

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.ibm.com/support/pages/node/6172539 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/177937 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4338?: CVE-2020-4338 is a medium-severity vulnerability in IBM Mq, classified under Information Disclosure. CVSS score: 5.5/10. Published 2020-04-16.
How severe is CVE-2020-4338?: Medium severity. CVSS v3 base score is 5.5 out of 10.