CVE-2019-14317

Name: CVE-2019-14317
Creator: NVD / NIST
Published: 2019-12-11T18:16:18.88+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2019-14317 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. wolfSSL and wolfCrypt 4.1.0 and earlier (formerly known as CyaSSL) generate biased DSA nonces. This allows a remote attacker to compute the long term private key from several hundred DSA signatures via a lattice attack. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

wolfSSL and wolfCrypt 4.1.0 and earlier (formerly known as CyaSSL) generate biased DSA nonces. This allows a remote attacker to compute the long term private key from several hundred DSA signatures via a lattice attack. The issue occurs because dsa.c fixes two bits of the generated nonces.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.75%

75.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-331

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	< 4.2.0

References

https://www.wolfssl.com/docs/security-vulnerabilities/Patch, Vendor Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/Patch, Vendor Advisory

Timeline

Published: Dec 11, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-14317?

How severe is CVE-2019-14317?

CVE-2019-14317 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2019-14317?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-14317?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST