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.
References (1)
Core 1
Core References
Patch, Vendor Advisory x_refsource_misc
https://www.wolfssl.com/docs/security-vulnerabilities/
Scores
CVSS v3
5.3
EPSS
0.0175
EPSS Percentile
74.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-331
Status
published
Products (1)
wolfssl/wolfssl
< 4.2.0
Published
Dec 11, 2019
Tracked Since
Feb 18, 2026