What is CVE-2019-19963?

CVE-2019-19963 is a medium-severity vulnerability in Wolfssl. CVSS score: 5.3/10. Published 2019-12-25.

How severe is CVE-2019-19963?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Wolfssl

CVE-2019-19963

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.

Published 2019-12-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (59.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Wolfssl

References

github.com/wolfSSL/wolfssl/releases/tag/v4.3.0-stable (Third Party Advisory, Release Notes)
github.com/wolfSSL/wolfssl/commit/7e391f0fd57f2ef375b1174d752a56ce34b2b190 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-19963?: CVE-2019-19963 is a medium-severity vulnerability in Wolfssl. CVSS score: 5.3/10. Published 2019-12-25.
How severe is CVE-2019-19963?: Medium severity. CVSS v3 base score is 5.3 out of 10.