In wolfSSL before 5.2.0, a TLS 1.3 server cannot properly enforce a requirement for mutual authentication. A client can simply omit the certificate_verify message from the handshake, and never present a certificate.
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Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-02-25. NVD baseline CVSS 7.5; sources differ by 0.0.
In wolfSSL before 5.2.0, a TLS 1.3 server cannot properly enforce a requirement for mutual authentication. A client can simply omit the certificate_verify message from the handshake, and never present a certificate.
February 24, 2022
November 21, 2024
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
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Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Exploitation of CVE-2020-256480 using scapy
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