What’s Vulnerable › Vulnerabilities

CVE-2018-15391: Cisco Remote PHY IPv4 Fragment Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.0)
• 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: 2018-10-05 · updated 2026-06-17
• Weakness: CWE-399

Description

A vulnerability in certain IPv4 fragment-processing functions of Cisco Remote PHY Software could allow an unauthenticated, remote attacker to impact traffic passing through a device, potentially causing a denial of service (DoS) condition. The vulnerability is due to the affected software not validating and calculating certain numerical values in IPv4 packets that are sent to an affected device. An attacker could exploit this vulnerability by sending malformed IPv4 traffic to an affected device. A successful exploit could allow the attacker to disrupt the flow of certain IPv4 traffic passing through an affected device, which could result in a DoS condition.

Affected products

• Cisco Remote PHY: phy

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-phy-ipv4-dos
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-phy-ipv4-dos

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