CVE-2013-5536: Cisco Secure Access Control System (ACS) does not properly implement an incoming-packet firewall rule, whic...

Security readout for executives and security teams

This issue can let a remote attacker crash a Cisco Secure ACS process by flooding it with crafted packets. The public bundle identifies denial of service risk, not data theft or code execution. Business urgency depends on whether Cisco Secure ACS distributed deployment is still present and reachable. Exposure is likely limited to organizations still running Cisco Secure ACS, especially distributed deployments. The bundle does not provide affected versions, CPEs, CVSS, or precise network interfaces, so asset inventory and Cisco advisory review are required. Prioritize this if Cisco Secure ACS still supports authentication or access-control workflows. A successful attack could disrupt identity-related services, but the provided evidence does not support data compromise or active exploitation claims. Mitigation focus: Identify Cisco Secure ACS deployments and whether they use distributed deployment.; Review Cisco advisory CSCui51521 for affected releases and vendor-specified remediation.; Apply Cisco-supported updates or workarounds only where the advisory confirms applicability..

Prepared

Jun 14, 2026, 15:32 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.