What’s Vulnerable › Vulnerabilities

CVE-2019-13629

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-03 · updated 2026-06-17
• Weakness: CWE-203

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.

Affected products

• Inside Secure MatrixSSL: through 4.2.1

References

• http://www.openwall.com/lists/oss-security/2019/10/02/2
• https://eprint.iacr.org/2011/232.pdf
• https://minerva.crocs.fi.muni.cz/
• https://tches.iacr.org/index.php/TCHES/article/view/7337
• http://www.openwall.com/lists/oss-security/2019/10/02/2
• https://eprint.iacr.org/2011/232.pdf
• https://minerva.crocs.fi.muni.cz/
• https://tches.iacr.org/index.php/TCHES/article/view/7337

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