What’s Vulnerable › Vulnerabilities

CVE-2020-15309

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-08-21 · updated 2026-06-17
• Weakness: CWE-362

Description

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).

Affected products

• wolfSSL: before 4.5.0 — fixed in 4.5.0

How to fix

Upgrade to a fixed version: wolfSSL 4.5.0. Check the vendor advisory for mitigations.

References

• https://arxiv.org/abs/2008.12188
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable
• https://arxiv.org/abs/2008.12188
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable

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