Cisco smart license utility - Authentication Bypass (CVE-2024-20439)
252Exploiting IPs reported
A vulnerability in Cisco Smart Licensing Utility (CSLU) could allow an unauthenticated, remote attacker to log into an affected system by using a static administrative credential. This vulnerability is due to an undocumented static user credential for an administrative account. An attacker could exploit this vulnerability by using the static credentials to login to the affected system. A successful exploit could allow the attacker to login to the affected system with administrative rights over the CSLU application API.
CrowdSec analysis
CVE-2024-20439 is a critical vulnerability in Cisco Smart Licensing Utility that allows attackers to gain administrative access through the use of a static credential.
CrowdSec has been tracking this vulnerability and its exploits since 3rd of April 2025.
According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2024-20439 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2024-20439 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2024-20439 is currently experiencing high visibility and active exploitation across the internet.
Observed exploitation attempts typically focus on URLs containing /cslu/v1/scheduler/jobs.
Exploitation
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Protection
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Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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