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Cisco Bug: CSCun01152 - IOS-XE router crashes in CPP ucode with zone-based firewall config

Last Modified

Apr 17, 2019

Products (20)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco ASR 901-4C-F-D Router
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Known Affected Releases

15.3(3)S1 15.4(1)S

Description (partial) 

Symptom: A Cisco IOS-XE router reloads unexpectedly.
Conditions: This symptom occurs when a zone-based firewall is configured on the router. The crash occurs due to a timing condition which can occur when two loosely coupled flows are deleted at the same time. This was observed in an environment with a large number of active MSRPC sessions traversing the firewall.
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