19 Apr, 2026

Cisco warns of CSLU backdoor admin account used in attacks

Cisco has warned admins to patch a critical Cisco Smart Licensing Utility (CSLU) vulnerability, which exposes a built-in backdoor admin account now used in attacks. CSLU is a Windows app for managing licenses and linked products on-premises without connecting them to Cisco’s cloud-based Smart Software Manager solution. Cisco patched this security flaw (CVE-2024-20439) in September, describing it […]

2 mins read

Critical Cisco Smart Licensing Utility flaws now exploited in attacks

Attackers have started targeting Cisco Smart Licensing Utility (CSLU) instances unpatched against a vulnerability exposing a built-in backdoor admin account. The CSLU Windows application allows admins to manage licenses and linked products on-premises without connecting them to Cisco’s cloud-based Smart Software Manager solution. Cisco patched this security flaw (tracked as CVE-2024-20439) in September, describing it as “an […]

2 mins read