CVE Catalog
CVE-1999-0453
MediumExploitation Probability (EPSS)
Elevated risk1.46%
70th percentile - higher than 70% of all known CVEs
Summary
An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).
Risk Assessment
The ability for attackers to identify CISCO devices may lead to further attacks on these devices, increasing the risk of network security breaches.
Recommendation
It is recommended to block port 1999 on firewalls and monitor traffic for unauthorized scanning attempts.
Original NVD description (English source)
An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).