The Cisco PE switch must be configured to ignore or drop all packets with any IP options.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-221128 | CISC-RT-000750 | SV-221128r999737_rule | CCI-002403 | medium |
| Description | ||||
| Packets with IP options are not fast-switched and therefore must be punted to the switch processor. Hackers who initiate denial-of-service (DoS) attacks on switches commonly send large streams of packets with IP options. Dropping the packets with IP options reduces the load of IP options packets on the switch. The end result is a reduction in the effects of the DoS attack on the switch and on downstream switches. | ||||
| STIG | Date | |||
| Cisco NX OS Switch RTR Security Technical Implementation Guide | 2026-03-04 | |||
Related Frameworks
1 mapping across 3 frameworks
Related 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.
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects
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.
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)3our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)3intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V3R4our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
CCI1 mapping
CCI-002403
1.00
- DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
Details
Check Text (C-221128r999737_chk)
In Cisco NX-OS, all packets with any header option other than the “source-route” header option are dropped. By default, ipv4 source routing is enabled. Verify that source routing is disabled via the following command:
no ip source-route
If the switch is not configured to drop all packets with IP option source routing, this is a finding.
Fix Text (F-22832r409874_fix)
Configure the switch to drop all packets with IP option source routing.
SW1(config)# no ip source-route
SW1(config)# end