CVE-2019-13628: wolfSSL

Medium severity, CVSS 4.7. EPSS: 0.4% chance of exploitation in the next 30 days.

wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without --enable-fpecc, --enable-sp, or --enable-sp-math) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.

Affected products

• wolfSSL wolfSSL: up to and including 4.0.0

Published 2019-10-03. Last modified 2026-06-17.