CSCux77124 - No source info in " percentUSER-3-SYSTEM_MSG NTP Receive dropping message:"

[ปลาวาฬทราย RMUTT CPE IX]

I think no workaround doesn't make sense. Why don't you provide how to cope the DDOS?

[Thomas Paine]

We had this, but only after we had to remove ACLs (to do what you're asking) and hit this nasty feature: CSCuu13856.  We had upgraded to 6.2.16 to get of off other vulnerabilities we had in 6.2.12. 

Bug CSCuu13856

[Daniel Cantele]

We also have this issue however it was on a Nexus 93108TC-EX which we just stood up. The software version of this device is 7.0(3)I4(2) and a bios of 07.56. Interesting to say the least...