CVE-2019-13628
This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used.
Does this matter?
Lower severity and a low EPSS score (0.38%). Track it; it rarely justifies an emergency change on its own.
Description
wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without --enable-fpecc, --enable-sp, or --enable-sp-math) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.38% probability · 32th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- wolfssl/wolfssl
- Source
- cve@mitre.org
EPSS 0.4% 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.pdfTechnical Description, Third Party Advisory
- https://minerva.crocs.fi.muni.cz/Product
- https://tches.iacr.org/index.php/TCHES/article/view/7337Technical Description, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/10/02/2Mailing List, Third Party Advisory
- https://eprint.iacr.org/2011/232.pdfTechnical Description, Third Party Advisory
- https://minerva.crocs.fi.muni.cz/Product
- https://tches.iacr.org/index.php/TCHES/article/view/7337Technical Description, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.