CVE-2018-16149: Axtls Project Axtls

Medium severity, CVSS 5.9. EPSS: 0.7% 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 blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.

Affected products

• Axtls Project Axtls: up to and including 2.1.3

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