High 7.5Known exploited (CISA KEV)Published Sep 19, 2016

CVE-2016-6415The server IKEv1 implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.6, IOS XE through 3.18S, IOS XR 4.3.x and 5.0.x through 5.2.x, and PIX before 7.0 allows remote attackers to obtain…

Updated under an hour ago (2026-10-19 06:10 UTC)

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It affects cisco ios and 2 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since May 19, 2023; federal agencies had to remediate by Jun 9, 2023. Treat that date as your deadline.

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Exploited in the last 30 days

The server IKEv1 implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.6, IOS XE through 3.18S, IOS XR 4.3.x and 5.0.x through 5.2.x, and PIX before 7.0 allows remote attackers to obtain sensitive information from device memory via a Security Association (SA) negotiation request, aka Bug IDs CSCvb29204 and CSCvb36055 or BENIGNCERTAIN.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Added to CISA KEV May 19, 2023; federal remediation due Jun 9, 2023Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 87.69% (percentile 100)
Assigned by: cisco
NVD analysis: Analyzed
Record last updated: Jan 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cisco ios cisco:ios	from 12.2 through 12.4; from 15.0 through 15.6	NVD
cisco ios_xe cisco:ios_xe	through 3.18s	NVD
cisco ios_xr cisco:ios_xr	from 4.3.0 through 4.3.4; from 5.0.0 before 5.3.0	NVD

References

http://www.securitytracker.com/id/1036841vdb-entry, x-refsource-sectrack, third-party-advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1vendor-advisory, x-refsource-cisco
http://www.securityfocus.com/bid/93003vdb-entry, x-refsource-bid, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6415us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.