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CVE-2018-0473: Cisco IOS Software Precision Time Protocol Denial of Service Vulnerability

• Severity: high (CVSS 8.6 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-05 · updated 2026-06-17
• Weakness: CWE-399

Description

A vulnerability in the Precision Time Protocol (PTP) subsystem of Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition of the Precision Time Protocol. The vulnerability is due to insufficient processing of PTP packets. An attacker could exploit this vulnerability by sending a custom PTP packet to, or through, an affected device. A successful exploit could allow the attacker to cause a DoS condition for the PTP subsystem, resulting in time synchronization issues across the network.

Affected products

• Cisco IOS: 15.2(4)e, 15.2(5)

References

• http://www.securityfocus.com/bid/105427
• http://www.securitytracker.com/id/1041737
• https://ics-cert.us-cert.gov/advisories/ICSA-19-094-03
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ptp
• http://www.securityfocus.com/bid/105427
• http://www.securitytracker.com/id/1041737
• https://ics-cert.us-cert.gov/advisories/ICSA-19-094-03
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ptp

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