CVE‑2018‑0180: Cisco IOS Login‑Block Feature Denial‑of‑Service Vulnerability
What It Is – A flaw in the Login Enhancements (Login Block) component of Cisco IOS Software can be triggered by an unauthenticated, remote attacker to force the device to reload, causing a denial‑of‑service condition.
Exploitability – Publicly disclosed; proof‑of‑concept code exists. The vulnerability is rated High (CVSS v3.0 ≈ 7.5). No known active exploit campaigns, but the attack surface is large because the flaw is reachable over the network without credentials.
Affected Products – Cisco IOS Software on routers and switches that implement the Login Block feature (all versions prior to the vendor‑issued patch).
Why It Matters for Trust & Control Assurance
- Demonstrates the need for continuous vulnerability‑management controls that can surface missing patches before an attacker can exploit them.
- A DoS event on core routing gear can break service‑level commitments, eroding the audit evidence you provide to customers about availability.
- Mapping this CVE to the control objective “Maintain up‑to‑date software and timely remediation of known vulnerabilities” satisfies a single VCF control that aligns with many frameworks (e.g., NIST CSF 2.0, ISO 27001).
Recommended Actions
- Verify whether any of your Cisco IOS devices are running a version vulnerable to CVE‑2018‑0180.
- Apply Cisco’s security advisory patch immediately, or implement a compensating control (e.g., block external access to the login interface).
- Update your vulnerability‑management inventory to capture remediation evidence for audit purposes.
- Incorporate the patch status into your continuous control‑monitoring dashboard to prove ongoing compliance.
Source: CISA KEV – CVE‑2018‑0180