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Unrated severityNVD Advisory· Published Jan 1, 1999· Updated Jun 16, 2026

CVE-1999-0453

CVE-1999-0453

Description

An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).

Affected products

2

Cisco Systems, Inc./Router
cpe:2.3:h:cisco:router:*:*:*:*:*:*:*:*
Cisco Systems, Inc./Cisco Discovery Protocolllm-create

Patches

Vulnerability mechanics

References

1

exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0453nvd

News mentions

0

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