CVE-2019-13628

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.

• CWE-203

• http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing List, Third Party Advisory
• https://eprint.iacr.org/2011/232.pdfTechnical Description, Third Party Advisory
• https://minerva.crocs.fi.muni.cz/Product
• https://tches.iacr.org/index.php/TCHES/article/view/7337Technical Description, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing List, Third Party Advisory
• https://eprint.iacr.org/2011/232.pdfTechnical Description, Third Party Advisory
• https://minerva.crocs.fi.muni.cz/Product
• https://tches.iacr.org/index.php/TCHES/article/view/7337Technical Description, Third Party Advisory

Published

Oct 3, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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