What is CVE-2020-4340?

CVE-2020-4340 is a medium-severity vulnerability in IBM Security Secret Server, classified under Improper Certificate Validation. CVSS score: 4.3/10. Published 2020-09-23.

How severe is CVE-2020-4340?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in IBM Security Secret Server

CVE-2020-4340

IBM Security Secret Server prior to 10.9 could allow an attacker to bypass SSL security due to improper certificate validation. IBM X-Force ID: 178180.

Vulnerability class: Improper Certificate Validation

Published 2020-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

IBM Security Secret Server — versions 10.8
IBM Security Secret Server
Microsoft Windows

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

www.ibm.com/support/pages/node/6336361 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/178180 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4340?: CVE-2020-4340 is a medium-severity vulnerability in IBM Security Secret Server, classified under Improper Certificate Validation. CVSS score: 4.3/10. Published 2020-09-23.
How severe is CVE-2020-4340?: Medium severity. CVSS v3 base score is 4.3 out of 10.