Information disclosure in Broadcom Brocade Active Support Connectivity Gateway

CVE-2025-6391

Brocade ASCG before 3.3.0 logs JSON Web Tokens (JWT) in log files. An attacker with access to the log files can withdraw the unencrypted tokens with security implications, such as unauthorized access, session hijacking, and information disclosure.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (17.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-6391: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-6391?
CVE-2025-6391 is a critical-severity vulnerability in Broadcom Brocade Active Support Connectivity Gateway, classified under Insertion of Sensitive Information into Log File. CVSS score: 9.1/10. Published 2025-07-17.
How severe is CVE-2025-6391?
Critical severity. CVSS v3 base score is 9.1 out of 10.