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The Cisco perimeter router must be configured to drop IPv6 packets containing a Destination Option header with invalid option type values.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-230150CISC-RT-000395SV-230150r1132503_ruleCCI-002403medium
Description
These options are intended to be for the Hop-by-Hop header only. The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not always drop packets with headers that it cannot recognize. Hence, this could cause a denial of service on the target device. In addition, the type, length, value (TLV) formatting provides the ability for headers to be very large.
STIGDate
Cisco IOS XE Router RTR Security Technical Implementation Guide2025-08-14

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) 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.

NET-03Boundary Protection
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) 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.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-002403
1.00

Details

Check Text (C-230150r1132503_chk)

This requirement is not applicable for the DODIN Backbone. Review the router configuration to determine if it is compliant with this requirement. Step 1: Verify that an inbound IPv6 ACL has been configured on the external interface. interface gigabitethernet1/0 ipv6 address 2001::1:0:22/64 ipv6 traffic-filter FILTER_IPV6 in Step 2: Verify that the ACL drops IPv6 packets containing a Destination Option header with option type values of 0x05 (Router Alert) or 0xC2 (Jumbo Payload) as shown in the example below. ipv6 access-list FILTER_IPV6 deny 60 any any dest-option log permit ipv6 … … … … deny ipv6 any any log Note: Cisco has deprecated the dest-option-type command used to filter by option type within the Destination Option header. Therefore, all packets with the Destination Option header must be dropped. If the router is not configured to drop IPv6 packets containing a Destination Option header, this is a finding.

Fix Text (F-32443r1132503_fix)

Configure the router to drop IPv6 packets containing a Destination Option header as shown in the example below. R1(config)#ipv6 access-list FILTER_IPV6 R1(config-ipv6-acl)#deny 60 any any dest-option log R1(config-ipv6-acl)#permit … … … … R1(config-ipv6-acl)#deny ipv6 any any log R1(config-ipv6-acl)#exit R1(config)#int g1/0 R1(config-if)#ipv6 traffic-filter FILTER_IPV6 R1(config-if)#end