CVE-2018-16253: Axtls Project Axtls

Medium severity, CVSS 5.9. EPSS: 0.6% chance of exploitation in the next 30 days.

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568.

Affected products

• Axtls Project Axtls: up to and including 2.1.3

Published 2018-11-07. Last modified 2026-06-17.