What is CVE-2016-1296?

CVE-2016-1296 is a high-severity vulnerability in Cisco Web Security Appliance, classified under CWE-254. CVSS score: 7.5/10. Published 2016-01-20.

How severe is CVE-2016-1296?

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

Vulnerability in Cisco Web Security Appliance

CVE-2016-1296

The proxy engine on Cisco Web Security Appliance (WSA) devices with software 8.5.3-055, 9.1.0-000, and 9.5.0-235 allows remote attackers to bypass intended proxy restrictions via a malformed HTTP method, aka Bug ID CSCux00848.

Published 2016-01-20 · 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: 0.021 (80.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Cisco Web Security Appliance — versions 8.5.3-055, 9.1.0-000, 9.5.0-235

Weakness classification (CWE)

CWE-254

References

www.securitytracker.com/id/1034763 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160119… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2016-1296?: CVE-2016-1296 is a high-severity vulnerability in Cisco Web Security Appliance, classified under CWE-254. CVSS score: 7.5/10. Published 2016-01-20.
How severe is CVE-2016-1296?: High severity. CVSS v3 base score is 7.5 out of 10.