CVE-2020-12457: Improper Input Validation

August 21, 2020 (updated July 21, 2021)

wolfSSL mishandles the change_cipher_spec (CCS) message processing logic for TLS If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.

References

nvd.nist.gov/vuln/detail/CVE-2020-12457

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