What is CVE-2020-4267?

CVE-2020-4267 is a medium-severity vulnerability in IBM Mq, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2020-04-24.

How severe is CVE-2020-4267?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in IBM Mq

CVE-2020-4267

IBM MQ and MQ Appliance 8.0, 9.1 LTS, and 9.1 CD could allow an authenticated user cause a denial of service due to a memory leak. IBM X-Force ID: 175840.

Published 2020-04-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

IBM Mq
IBM Mq Appliance — versions 8.0.0.3, 8.0.0.4, 8.0.0.5
IBM Mq Appliance

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

www.ibm.com/support/pages/node/6195384 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/175840 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4267?: CVE-2020-4267 is a medium-severity vulnerability in IBM Mq, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2020-04-24.
How severe is CVE-2020-4267?: Medium severity. CVSS v3 base score is 6.5 out of 10.