CISA-confirmed known exploited vulnerability

CVE-2016-6415

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

Cisco · IOS, IOS XR, and IOS XE

Vulnerability details

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.

Added to CISA KEV: 2023-05-19

Ransomware campaign use: Unknown

CISA due date: 2023-06-09

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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