CVE-2019-13628

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% 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

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.

Affected products

wolfSSL: through 4.0.0

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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