No exploitation reported

CVE-2016-6381

No exploitation reported by the sources we read.

Published2016-10-05
WeaknessCWE-399

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Cisco IOS 12.4 and 15.0 through 15.6 and IOS XE 3.1 through 3.18 and 16.1 allow remote attackers to cause a denial of service (memory consumption or device reload) via fragmented IKEv1 packets, aka Bug ID CSCuy47382.

Timeline

dates in UTC

2016-10-0517:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-6381?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6381?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco ios

Branch	Affected	Fixed in	Source
12.4	= 12.4\(15\)t7	no fix published	NVD
12.4	= 12.4\(15\)t8	no fix published	NVD
12.4	= 12.4\(15\)t9	no fix published	NVD
12.4	= 12.4\(15\)t10	no fix published	NVD
12.4	= 12.4\(15\)t11	no fix published	NVD
12.4	= 12.4\(15\)t12	no fix published	NVD
12.4	= 12.4\(15\)t13	no fix published	NVD
12.4	= 12.4\(15\)t14	no fix published	NVD
12.4	= 12.4\(15\)t15	no fix published	NVD
12.4	= 12.4\(15\)t16	no fix published	NVD
12.4	= 12.4\(15\)t17	no fix published	NVD
12.4	= 12.4\(15\)xl4	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.07.1read 2026-10-23
NVDweakness (CWE)CWE-399read 2026-10-23
FIRST EPSSEPSS score3.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2016-10-05
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-6381?

Is CVE-2016-6381 actively exploited?

Active exploitation of CVE-2016-6381 has not been confirmed. Its EPSS score was 3.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-6381?

CVE-2016-6381 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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