What is CVE-2020-4399?

CVE-2020-4399 is a medium-severity vulnerability in IBM Verify Gateway. CVSS score: 6.5/10. Published 2020-07-22.

How severe is CVE-2020-4399?

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

Vulnerability in IBM Verify Gateway

CVE-2020-4399

IBM Verify Gateway (IVG) 1.0.0 and 1.0.1 could allow an authenticated user to send malformed requests to cause a denial of service against the server. IBM X-Force ID: 179476.

Published 2020-07-22 · 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: 0.011 (65.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

IBM Verify Gateway — versions 1.0.0, 1.0.1
IBM Verify Gateway (Ivg) — versions 1.0.0, 1.0.1

References

www.ibm.com/support/pages/node/6251323 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/179476 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4399?: CVE-2020-4399 is a medium-severity vulnerability in IBM Verify Gateway. CVSS score: 6.5/10. Published 2020-07-22.
How severe is CVE-2020-4399?: Medium severity. CVSS v3 base score is 6.5 out of 10.