CVE-2020-12457 (NVD)

2020-08-21

An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. 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.

Products Wolfssl
Type Improper Input Validation (CWE-20)
First patch - None (likely due to unavailable code)
Patches https://github.com/wolfSSL/wolfssl/pull/2927
Links https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable