CVE-2016-6415

Name: CVE-2016-6415
Creator: NVD / NIST
Published: 2016-09-19T01:59:06.167+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 87.69%

Last modified Jun 17, 2026

CVE-2016-6415 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 87.69% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

87.69%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 9, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Ios	>= 12.2, <= 12.4
Cisco	Ios	>= 15.0, <= 15.6
Cisco	Ios Xe	<= 3.18s
Cisco	Ios Xr	>= 4.3.0, <= 4.3.4
Cisco	Ios Xr	>= 5.0.0, < 5.3.0

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1Vendor Advisory
http://www.securityfocus.com/bid/93003Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036841Third Party Advisory, VDB Entry
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1Vendor Advisory
http://www.securityfocus.com/bid/93003Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036841Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6415US Government Resource

Timeline

Published: Sep 19, 2016
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2016-6415?

How severe is CVE-2016-6415?

CVE-2016-6415 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 87.69% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2016-6415?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-6415?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST