CVE-2019-13629
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.
Does this matter?
Lower severity and a low EPSS score (1.24%). Track it; it rarely justifies an emergency change on its own.
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
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.24% probability · 69th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-203, CWE-327
- Affected
- matrixssl/matrixssl
- Source
- cve@mitre.org
EPSS 1.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.