CVE-2019-13629

5.9 mediumEPSS 1.2%

Medium (5.9) in matrixssl matrixssl. EPSS 1.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.9 medium

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

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWEs: CWE-203, CWE-327
Published: 2019-10-03
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

matrixssl:matrixssl

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

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