An issue was discovered in wolfSSL before 4.5.0, when single precision is not employed. Local attackers can conduct a cache-timing attack against public key operations. These attackers may already have obtained sensitive information if the affected system has been used for private key operations (e.g., signing with a private key).

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-15309
• https://arxiv.org/abs/2008.12188
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable