What is CVE-2020-4747?

CVE-2020-4747 is a critical-severity vulnerability in IBM Connect\, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-12-15.

How severe is CVE-2020-4747?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in IBM Connect\

CVE-2020-4747

IBM Connect:Direct for UNIX 6.1.0, 6.0.0, 4.3.0, and 4.2.0 can allow a local or remote user to obtain an authenticated CLI session due to improper authentication methods. IBM X-Force ID: 188516.

Vulnerability class: Broken Authentication

Published 2020-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: +0.000

Affected products

IBM Connect\ — versions direct
IBM Connect\:direct — versions 4.2.0, 4.3.0, 6.0.0
IBM Sterling Connect:direct For Unix — versions 4.2.0, 4.3.0, 6.0.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.ibm.com/support/pages/node/6381904 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/188516 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4747?: CVE-2020-4747 is a critical-severity vulnerability in IBM Connect\, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-12-15.
How severe is CVE-2020-4747?: Critical severity. CVSS v3 base score is 9.8 out of 10.