High severity7.5NVD Advisory· Published Aug 21, 2020· Updated Jun 17, 2026
CVE-2020-12457
CVE-2020-12457
Description
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.
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Affected products
2Patches
Vulnerability mechanics
References
2- github.com/wolfSSL/wolfssl/pull/2927nvdPatchThird Party Advisory
- github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stablenvdThird Party Advisory
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