What is CVE-2016-6407?

CVE-2016-6407 is a high-severity vulnerability in Cisco Web Security Appliance, classified under CWE-399. CVSS score: 7.5/10. Published 2016-09-17.

How severe is CVE-2016-6407?

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

Vulnerability in Cisco Web Security Appliance

CVE-2016-6407

Cisco AsyncOS through 9.5.0-444 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (link saturation) by making many HTTP requests for overlapping byte ranges simultaneously, aka Bug ID CSCuz27219.

Published 2016-09-17 · 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:N/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.3th percentile), scored 2026-10-21.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.025 · change: +0.001

Affected products

Cisco Web Security Appliance — versions 5.6.0-623, 6.0.0-000, 7.1.0

Weakness classification (CWE)

CWE-399

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160914… (vendor-advisory, Vendor Advisory)
www.securitytracker.com/id/1036829 (vdb-entry)
www.securityfocus.com/bid/92955 (vdb-entry)

Frequently asked questions

What is CVE-2016-6407?: CVE-2016-6407 is a high-severity vulnerability in Cisco Web Security Appliance, classified under CWE-399. CVSS score: 7.5/10. Published 2016-09-17.
How severe is CVE-2016-6407?: High severity. CVSS v3 base score is 7.5 out of 10.