CVE-2019-4655

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-12-30 · updated 2026-06-17

Description

IBM MQ 9.1.0.0, 9.1.0.1, 9.1.0.2, 9.1.0.3, 9.1.1, 9.1.2, and 9.1.3 is vulnerable to a denial of service attack that would allow an authenticated user to reset client connections due to an error within the Data Conversion routine. IBM X-Force ID: 170966.

Affected products

IBM MQ: from 9.1.0 before 9.1.4; from 9.1.0.0 before 9.1.0.4 — fixed in 9.1.0.4, 9.1.4
IBM MQ Appliance: from 9.1.0 before 9.1.4; from 9.1.0.0 before 9.1.0.4 — fixed in 9.1.0.4, 9.1.4

How to fix

Upgrade to a fixed version: IBM MQ 9.1.0.4, 9.1.4; IBM MQ Appliance 9.1.0.4, 9.1.4. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/170966
https://www.ibm.com/support/pages/node/1106529
https://exchange.xforce.ibmcloud.com/vulnerabilities/170966
https://www.ibm.com/support/pages/node/1106529

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