CVE-2019-13629

MatrixSSL 4.2.1 and earlier contains a timing side channel in ECDSA signature generation. This allows a local or a remote attacker, able to measure the duration of hundreds to thousands of signing operations, to compute the private key used. The issue occurs because crypto/pubkey/ecc_math.c scalar multiplication leaks the bit length of the scalar.

• CWE-203
• CWE-327

• http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing List, Third Party Advisory
• https://eprint.iacr.org/2011/232.pdfNot Applicable
• https://minerva.crocs.fi.muni.cz/Product
• https://tches.iacr.org/index.php/TCHES/article/view/7337Not Applicable
• http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing List, Third Party Advisory
• https://eprint.iacr.org/2011/232.pdfNot Applicable
• https://minerva.crocs.fi.muni.cz/Product
• https://tches.iacr.org/index.php/TCHES/article/view/7337Not Applicable

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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