STIGQter: STIG Summary: Nokia Service Router OS 25.x Router Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 28 Apr 2026:

The Nokia router must be configured to drop all fragmented Internet Control Message Protocol (ICMP) packets destined to itself.

DISA Rule

SV-283891r1203922_rule

Vulnerability Number

V-283891

Group Title

SRG-NET-000205-RTR-000002

Rule Version

NOKI-RT-000760

Severity

CAT II

CCI(s)

• CCI-001097 - Monitor and control communications at the external managed interfaces to the system and at key managed interfaces within the system.

Weight

10

Fix Recommendation

Configure the CPM filter to drop all fragmented ICMP packets destined to itself, as shown in the example below:

- configure system security cpm-filter
- config>sys>security>cpm-filter# default-action accept
- config>sys>security>cpm-filter# ip-filter
- config>sys>sec>cpm>ip-filter# entry 10 create
- cfg>sys>sec>cpm>ip-filter>entry# match protocol "icmp"
- cfg>sys>sec>cpm>ip-filter>entry>match# fragment true
- cfg>sys>sec>cpm>ip-filter>entry>match# exit
- cfg>sys>sec>cpm>ip-filter>entry# action drop
- cfg>sys>sec>cpm>ip-filter>entry# exit
- config>sys>sec>cpm>ip-filter# no shutdown
- config>sys>sec>cpm>ip-filter# exit
- config>sys>security>cpm-filter# exit all

Check Contents

Review the access control list (ACL) or filter for the router receive path.

Review the CPM filter to verify the router is configured to drop all fragmented ICMP packets destined to itself using the example below:

- show system security cpm-filter ip-filter entry 10

CPM IP Filter Entry

Entry Id : 10
Description : (Not Specified)
-------------------------------------------------------------------------------
Filter Entry Match Criteria :
-------------------------------------------------------------------------------
Log Id : n/a
Src. IP : n/a
Src. Port : n/a
Dst. IP : n/a
Dest. Port : n/a
Protocol : icmp Dscp : Undefined
ICMP Type : Undefined ICMP Code : Undefined
Fragment : True Option-present : Off
IP-Option : n/a Multiple Option : Off
TCP-syn : Off TCP-ack : Off
Action : Drop
Match Router ID : n/a
Dropped pkts : 0 Forwarded pkts : 0

If the router is not configured with a receive-path filter to drop all fragmented ICMP packets, this is a finding.

Vulnerability Number

V-283891

Documentable

False

Rule Version

NOKI-RT-000760

Severity Override Guidance

Review the access control list (ACL) or filter for the router receive path.

Review the CPM filter to verify the router is configured to drop all fragmented ICMP packets destined to itself using the example below:

- show system security cpm-filter ip-filter entry 10

CPM IP Filter Entry

Entry Id : 10
Description : (Not Specified)
-------------------------------------------------------------------------------
Filter Entry Match Criteria :
-------------------------------------------------------------------------------
Log Id : n/a
Src. IP : n/a
Src. Port : n/a
Dst. IP : n/a
Dest. Port : n/a
Protocol : icmp Dscp : Undefined
ICMP Type : Undefined ICMP Code : Undefined
Fragment : True Option-present : Off
IP-Option : n/a Multiple Option : Off
TCP-syn : Off TCP-ack : Off
Action : Drop
Match Router ID : n/a
Dropped pkts : 0 Forwarded pkts : 0

If the router is not configured with a receive-path filter to drop all fragmented ICMP packets, this is a finding.

Check Content Reference

M

Target Key

5746