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The Cisco router must be configured to authenticate Network Time Protocol (NTP) sources using authentication with FIPS-compliant algorithms.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-216540CISC-ND-001150SV-216540r1156820_ruleCCI-001967medium
Description
If NTP is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.
STIGDate
Cisco IOS XR Router NDM Security Technical Implementation Guide2026-02-26

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

IAC-04Identification & Authentication for Devices
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (49) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(10)Authenticate Remote Commands
1.00
AC-17(2)Protection of Confidentiality and Integrity Using Encryption
1.00
AC-18(1)Authentication and Encryption
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-4(17)Domain Authentication
1.00
AC-7Unsuccessful Logon Attempts
1.00
AU-8Time Stamps
1.00

+39 more (top 10 by confidence shown)

CCI1 mapping
CCI-001967
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 4 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

PR.AA-01
0.50
PR.AA-03
0.50
PR.AA-05
0.50

Details

Check Text (C-216540r1156820_chk)

Review the Cisco router configuration to verify that it authenticates NTP sources using authentication with FIPS-compliant algorithms as shown in the configuration example below: ntp authentication-key 1 hmac-sha2 encrypted xxxxxx trusted-key 1 authenticate server 198.51.100.1 key 1 If the Cisco router is not configured to authenticate NTP sources using authentication with FIPS-compliant algorithms, this is a finding.

Fix Text (F-17772r1156819_fix)

Configure the Cisco router to authenticate NTP sources using authentication with FIPS-compliant algorithms as shown in the example below: RP/0/0/CPU0:router# configure RP/0/0/CPU0:router(config)# ntp RP/0/0/CPU0:router(config-ntp)# authentication-key 1 hmac-sha2 encrypted xxxxxx RP/0/0/CPU0:router(config-ntp)# trusted-key 1 RP/0/0/CPU0:router(config-ntp)# authenticate RP/0/0/CPU0:router(config-ntp)# server 198.51.100.1 key 1 RP/0/0/CPU0:router(config-ntp)# commit