Cisco Smart License Utility - Authentication Bypass (CVE-2024-20439)
Description
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.
psychologyCrowdSec 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.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2024-20439 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2024-20439 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2024-20439 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.
Observed exploitation attempts typically focus on URLs containing /cslu/v1/scheduler/jobs.
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| Event | Date |
|---|---|
| CVE Published | 2024-09-04 |
| CISA KEV | 2025-03-31 |
| Rule Released | 2025-04-03 |
| CrowdSec First Seen | 2025-04-07 |
| CISA Remediation Deadline | 2025-04-21 |