CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability

CISA Known Exploited Vulnerabilities

Name

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

Vendor

Cisco

Product

IOS, IOS XR, and IOS XE

Added to the catalog

2023-05-19

Due date for US federal agencies

2023-06-09

Weaknesses

CWE-200

Catalog version

2026.10.30

Cisco IOS, IOS XR, and IOS XE contain insufficient condition checks in the part of the code that handles Internet Key Exchange version 1 (IKEv1) security negotiation requests. contains an information disclosure vulnerability in the Internet Key Exchange version 1 (IKEv1) that could allow an attacker to retrieve memory contents. Successful exploitation could allow the attacker to retrieve memory contents, which can lead to information disclosure.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1
• https://nvd.nist.gov/vuln/detail/CVE-2016-6415

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2016-09-19T01:59:06.167

Last modified

2026-06-17T00:50:59.430

Weaknesses

CWE-200

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.

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)
• 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)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:35.381Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2016-6415

CVE record

Assigner

cisco

State

PUBLISHED

Published

2016-09-19T01:00:00.000Z

Updated

2026-01-12T21:16:07.939Z

Problem types

n/a

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.

References

• 1036841
• 20160916 IKEv1 Information Disclosure Vulnerability in Multiple Cisco Products
• 93003

Read on 2026-11-03T00:34:00.313Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2016/6xxx/CVE-2016-6415.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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