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Cisco Bug: CSCum25232 - ASR1K: ModExp failure with RSA key lengths that are not power of two

Last Modified

Nov 27, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(1)S2 15.3(1)S 15.3(3)S 15.4(1)S

Description (partial)

ASR1K will fail to verify a message that is signed using a non-standard RSA key length  (2024 for example). The failure is commonly seen during SCEP enrollment or when validating a peer certificate when RSA-SIG is used for phase 1 authentication.

The failure has been observed on ASRs using an integrated ESP
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