What is CVE-2021-38958?

CVE-2021-38958 is a medium-severity vulnerability in IBM Mq Appliance. CVSS score: 5.5/10. Published 2021-11-30.

How severe is CVE-2021-38958?

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

Vulnerability in IBM Mq Appliance

CVE-2021-38958

IBM MQ Appliance 9.2 CD and 9.2 LTS is affected by a denial of service attack caused by a concurrency issue. IBM X-Force ID: 212042

Published 2021-11-30 · 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:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (11.2th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

IBM Mq Appliance — versions 9.2.0.0, 9.2.1, 9.2.0.1
IBM Mq Appliance — versions 9.2.0.0

References

www.ibm.com/support/pages/node/6519420 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/212043 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-38958?: CVE-2021-38958 is a medium-severity vulnerability in IBM Mq Appliance. CVSS score: 5.5/10. Published 2021-11-30.
How severe is CVE-2021-38958?: Medium severity. CVSS v3 base score is 5.5 out of 10.