What is CVE-2025-64649?

CVE-2025-64649 is a medium-severity vulnerability in IBM Concert, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-08-28.

How severe is CVE-2025-64649?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in IBM Concert

CVE-2025-64649

IBM Concert 1.0.0 through 2.3.1 could allow a remote attacker to perform unauthorized actions using man in the middle techniques due to improper certificate validation.

Vulnerability class: Improper Certificate Validation

Published 2026-08-28 · last modified 2026-09-02.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (5.6th percentile), scored 2026-10-13.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

IBM Concert

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

www.ibm.com/support/pages/node/7285337 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64649?: CVE-2025-64649 is a medium-severity vulnerability in IBM Concert, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-08-28.
How severe is CVE-2025-64649?: Medium severity. CVSS v3 base score is 5.9 out of 10.