What is CVE-2016-6384?

CVE-2016-6384 is a high-severity vulnerability in Cisco iOS, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2016-10-05.

How severe is CVE-2016-6384?

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

Improper input validation in Cisco iOS

CVE-2016-6384

Cisco IOS 12.2 through 12.4 and 15.0 through 15.6 and IOS XE 3.1 through 3.17 and 16.2 allow remote attackers to cause a denial of service (device reload) via crafted fields in an H.323 message, aka Bug ID CSCux04257.

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

Published 2016-10-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.042 (90.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000

Affected products

Cisco iOS
Cisco iOS Xe — versions 16.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securitytracker.com/id/1036914 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928… (vendor-advisory, Vendor Advisory)
www.securityfocus.com/bid/93209 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2016-6384?: CVE-2016-6384 is a high-severity vulnerability in Cisco iOS, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2016-10-05.
How severe is CVE-2016-6384?: High severity. CVSS v3 base score is 7.5 out of 10.