What is CVE-2016-6465?

CVE-2016-6465 is a medium-severity vulnerability in Cisco Email Security Appliance, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2016-12-14.

How severe is CVE-2016-6465?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Improper input validation in Cisco Email Security Appliance

CVE-2016-6465

A vulnerability in the content filtering functionality of Cisco AsyncOS Software for Cisco Email Security Appliances and Cisco Web Security Appliances could allow an unauthenticated, remote attacker to bypass user filters that are configured for an affected device. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for both virtual and hardware versions of the following Cisco products: Cisco Email Security Appliances (ESAs) that are configured to use message or content filters that scan incoming email attachments; Cisco Web Security Appliances (WSAs) that are configured to use services that scan accessed web content. More Information: CSCva90076, CSCvb06764. Known Affected Releases: 10.0.0-125 8.5.7-042 9.7.2-047.

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

Published 2016-12-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Cisco Email Security Appliance — versions 8.5.7-042, 9.7.2-047, 10.0.0-125
Cisco Asyncos — versions Cisco AsyncOS

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securitytracker.com/id/1037404 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207… (Vendor Advisory)
www.securityfocus.com/bid/94901 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2016-6465?: CVE-2016-6465 is a medium-severity vulnerability in Cisco Email Security Appliance, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2016-12-14.
How severe is CVE-2016-6465?: Medium severity. CVSS v3 base score is 4.3 out of 10.