Is CVE-2016-6415 being actively exploited?

Yes. CVE-2016-6415 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on May 19, 2023.

What is the CVSS score for CVE-2016-6415?

CVE-2016-6415 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2016-6415

HIGH · CVSS 7.5CISA KEV: actively exploitedEPSS 87.7%EU EUVD: exploited

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.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-200
EPSS score: 87.7% (100th percentile)
In CISA KEV: Yes, added May 19, 2023
In EU EUVD: Yes (EUVD-2016-7338)
Published: September 19, 2016
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability

Added to the KEV catalog on May 19, 2023; federal remediation due June 9, 2023.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2016-7338 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on January 12, 2026.

View on the EU Vulnerability Database

Affected products

cisco / ios
cisco / ios xe
cisco / ios xr

Certified products that may be affected

9 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Catalyst 4500 Series Wired Access Switches running IOS-XE 3.10 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-10906-2018 - archived
Cisco Catalyst 3K/4K Wired Access Switches running IOS-XE 3.8.0E - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10688-2016 - archived
Cisco Aggregation Services Router (ASR) 1000 Series, IOS XE 3.13 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10609-2015 - archived
Cisco Integrated Services Router 4400 Series (ISR-4400), IOS XE 3.13.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10600-2015 - archived
Cisco Catalyst 3650, 3850, 4500E (Sup7E, Sup7LE, Sup8E), 4500X, 4500XF running IOS-XE 3.6.1S - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10607-2014 - archived

See all 9 in the Security Certifications Explorer.

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1(Vendor Advisory)
http://www.securityfocus.com/bid/93003(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1036841(Third Party Advisory, VDB Entry)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6415(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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