What is CVE-2020-4766?

CVE-2020-4766 is a high-severity vulnerability in IBM Mq Internet Pass-Thru, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-01-22.

How severe is CVE-2020-4766?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in IBM Mq Internet Pass-Thru

CVE-2020-4766

IBM MQ Internet Pass-Thru 2.1 and 9.2 could allow a remote user to cause a denial of service by sending malformed MQ data requests which would consume all available resources. IBM X-Force ID: 188093.

Vulnerability class: DoS (Denial of Service)

Published 2021-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.015 (72.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

IBM Mq Internet Pass-Thru — versions 2.1, 9.2
IBM Mq Internet Pass-Thru — versions 2.1, 9.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.ibm.com/support/pages/node/6406254 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/188903 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4766?: CVE-2020-4766 is a high-severity vulnerability in IBM Mq Internet Pass-Thru, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-01-22.
How severe is CVE-2020-4766?: High severity. CVSS v3 base score is 7.5 out of 10.