What is CVE-2016-6394?

CVE-2016-6394 is a critical-severity vulnerability in Cisco Firesight System Software, classified under CWE-264. CVSS score: 9.1/10. Published 2016-09-12.

How severe is CVE-2016-6394?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Cisco Firesight System Software

CVE-2016-6394

Session fixation vulnerability in Cisco Firepower Management Center and Cisco FireSIGHT System Software through 6.1.0 allows remote attackers to hijack web sessions via a session identifier, aka Bug ID CSCuz80503.

Published 2016-09-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Cisco Firesight System Software — versions 5.2.0, 5.2.0.1, 5.2.0.2

Weakness classification (CWE)

CWE-264

References

www.securityfocus.com/bid/92825 (vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160907… (vendor-advisory, Vendor Advisory)
www.securitytracker.com/id/1036757 (vdb-entry)

Frequently asked questions

What is CVE-2016-6394?: CVE-2016-6394 is a critical-severity vulnerability in Cisco Firesight System Software, classified under CWE-264. CVSS score: 9.1/10. Published 2016-09-12.
How severe is CVE-2016-6394?: Critical severity. CVSS v3 base score is 9.1 out of 10.