What is CVE-2016-6411?

CVE-2016-6411 is a high-severity vulnerability in Cisco Firesight System Software, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2016-09-24.

How severe is CVE-2016-6411?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Cisco Firesight System Software

CVE-2016-6411

Cisco Firepower Management Center and FireSIGHT System Software 6.0.1 mishandle comparisons between URLs and X.509 certificates, which allows remote attackers to bypass intended do-not-decrypt settings via a crafted URL, aka Bug ID CSCva50585.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2016-09-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% 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

Cisco Firesight System Software — versions 6.0.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securitytracker.com/id/1036877 (vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160921… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2016-6411?: CVE-2016-6411 is a high-severity vulnerability in Cisco Firesight System Software, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2016-09-24.
How severe is CVE-2016-6411?: High severity. CVSS v3 base score is 7.5 out of 10.