Known Exploited Vulnerability: CVE-2016-6415

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

Catalog version: 2026.06.05 Date added: 2023-05-19 Due date: 2023-06-09 CISA catalog

Vendor: Cisco

Product: IOS, IOS XR, and IOS XE

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: Unknown

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

CWEs

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