What’s Vulnerable › Vulnerabilities

CVE-1999-0453

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 1999-01-01 · updated 2026-06-16
• Weakness: CWE-200

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

• Cisco Router: all versions

References

• https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0453
• https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0453

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