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Cisco Bug: CSCvs06889 - IOS router crashes with Crypto PAK's unavailable error from crypto engine.

Last Modified

Sep 21, 2020

Products (1)

  • Cisco 3G Wireless WAN

Known Affected Releases


Description (partial)

Cisco IOS ISR loses Crypto PAK structures over time, flooding the router's buffer with the following error message:

"%VPN_HW-1-ERROR: slot: 0 - Crypto PAK's unavailable for handler"

The device eventually crashes. Decodes from the crashes show that the router is calling the crypto engine to encrypt/decrypt packets on every crash that is observed. The device is up for approx. 7 days before the crash occurs.

It was observed that the device is under a considerable constant CPU utilization due to CEF. The CPU remains around 40% due to CEF. After approx. 7 days, the device starts to generate crypto PAK's unavailable error messages and eventually crashes.
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