What is CVE-2021-29843?

CVE-2021-29843 is a medium-severity vulnerability in IBM Mq Appliance. CVSS score: 6.5/10. Published 2021-11-08.

How severe is CVE-2021-29843?

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

Vulnerability in IBM Mq Appliance

CVE-2021-29843

IBM MQ 9.1 LTS, 9.1 CD, 9.2 LTS, and 9.2CD is vulnerable to a denial of service attack caused by an issue processing message properties. IBM X-Force ID: 205203.

Published 2021-11-08 · 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: 0.009 (59.5th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

IBM Mq Appliance — versions 9.1.LTS, 9.1.CD, 9.2.LTS
IBM Mq Appliance

References

www.ibm.com/support/pages/node/6513681 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/205203 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-29843?: CVE-2021-29843 is a medium-severity vulnerability in IBM Mq Appliance. CVSS score: 6.5/10. Published 2021-11-08.
How severe is CVE-2021-29843?: Medium severity. CVSS v3 base score is 6.5 out of 10.