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PCI Compliancy switches UDP Constant IP Identification Field Fingerprinting

Title say a lot. Customer has had a PCI scan, and this was one of the vulnerabilities that came up. I cannot find anything related to this anywhere.

Cisco IOS 11.3-12.4 TCP/IP Fingerprint U1053:23|cisco NTP

Only thing I found so far relates to Linux Kernel 2.4. It is somewhat confusing since the OS field shows TCP and NTP, while the vulnerability shows UDP.

By any chance would this be related to the SNMP monitoring and traps? We use SNMP to monitor all the devices.

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