CVE-2019-13628

Name: CVE-2019-13628
Creator: NVD / NIST
Published: 2019-10-03T14:15:11.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2019-13628 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.7/10

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

EPSS Probability

0.36%

28.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	<= 4.0.0

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

Timeline

Published: Oct 3, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-13628?

How severe is CVE-2019-13628?

CVE-2019-13628 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2019-13628?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-13628?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST