CVE-2013-1623: Yassl Cyassl

Medium severity, CVSS 4.3. EPSS: 2.4% chance of exploitation in the next 30 days.

The TLS and DTLS implementations in wolfSSL CyaSSL before 2.5.0 do not properly consider timing side-channel attacks on a noncompliant MAC check operation during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, a related issue to CVE-2013-0169.

Affected products

• Yassl Cyassl: up to and including 2.4.6; version 0.2.0 only; version 0.3.0 only; version 0.4.0 only; version 0.5.0 only; version 0.5.5 only; …

Published 2013-02-08. Last modified 2026-06-16.