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Vulnerability record · CVE-2019-13629 · published 3 October 2019

CVE-2019-13629: Matrixssl observable discrepancy vulnerability

MMatrixssl · Matrixssl

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.

5.9 CVSS 3.1 Medium EPSS 1.2% · top 31.9% CWE-203 · Observable discrepancyCWE-327 · Broken cryptographic algorithm
5.9CVSS 3.1 base score, v2 4.3
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-13629), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.