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.

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…

EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.

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.

Affected products

Broadcom Brocade_active_support_connectivity_gateway
Broadcom Brocade Ascg — versions before 3.3.0

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

sirt@brocade.com (Vendor Advisory)

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.