Cisco IOS/IOS XE IKEv2 Denial‑of‑Service Vulnerability (CVE‑2017‑12237) Impacts Network Devices
What It Is — A denial‑of‑service flaw in the Internet Key Exchange version 2 (IKEv2) module of Cisco IOS and IOS XE that allows an unauthenticated remote attacker to drive high CPU utilization, generate traceback messages, or force a device reload.
Exploitability — Publicly disclosed; remote unauthenticated attacks are trivial; CVSS v3.1 base score 7.5 (High).
Affected Products — Cisco IOS and IOS XE running on routers, switches, firewalls, and other network appliances that implement IKEv2.
Why It Matters for Trust & Control Assurance
- Demonstrates the need for a documented, continuously‑validated patch‑management control that can be presented as audit evidence across frameworks (e.g., NIST CSF Identify‑Protect).
- Highlights the importance of real‑time device telemetry; logs of CPU spikes and IKEv2 activity provide a defensible trail of compliance with operational resilience controls.
- Supplies a concrete control‑mapping example: “Apply security patches within 30 days of release” – a control objective that satisfies many regulatory expectations simultaneously.
Recommended Actions
- Verify the firmware version on all Cisco IOS/IOS XE assets and apply Cisco’s security advisory patch for CVE‑2017‑12237.
- Enable CPU and IKEv2 telemetry; feed alerts into a SIEM or network‑monitoring platform for continuous oversight.
- Update your asset inventory and map the patch‑management activity to the relevant Verisq Common Framework control objective.
Source: CISA KEV – CVE‑2017‑12237