CVE-2020-12457

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.

• CWE-835

• https://github.com/wolfSSL/wolfssl/pull/2927Patch, Third Party Advisory
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stableThird Party Advisory
• https://github.com/wolfSSL/wolfssl/pull/2927Patch, Third Party Advisory
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stableThird Party Advisory

Published

Aug 21, 2020

Last Modified

Jun 17, 2026

Status

Modified

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