What’s Vulnerable › Vulnerabilities

CVE-2019-19963

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-25 · updated 2026-06-17

Description

An issue was discovered in wolfSSL before 4.3.0 in a non-default configuration where DSA is enabled. DSA signing uses the BEEA algorithm during modular inversion of the nonce, leading to a side-channel attack against the nonce.

Affected products

• wolfSSL: before 4.3.0 — fixed in 4.3.0

How to fix

Upgrade to a fixed version: wolfSSL 4.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/wolfSSL/wolfssl/commit/7e391f0fd57f2ef375b1174d752a56ce34b2b190
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.3.0-stable
• https://github.com/wolfSSL/wolfssl/commit/7e391f0fd57f2ef375b1174d752a56ce34b2b190
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.3.0-stable

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