What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2023-05-19
• EPSS: 87.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2016-09-19 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• Cisco IOS: from 12.2 through 12.4; from 15.0 through 15.6
• Cisco IOS XE: through 3.18s
• Cisco IOS XR Software: from 4.3.0 through 4.3.4; from 5.0.0 before 5.3.0 — fixed in 5.3.0

How to fix

Upgrade to a fixed version: Cisco IOS XR Software 5.3.0. Check the vendor advisory for mitigations.

References

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1
• http://www.securityfocus.com/bid/93003
• http://www.securitytracker.com/id/1036841
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1
• http://www.securityfocus.com/bid/93003
• http://www.securitytracker.com/id/1036841
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6415

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