MatrixSSL ASN.1 Handling Out-of-Bounds Read Vulnerability [CVE-2019-13470]

CVE Number – CVE-2019-13470

A vulnerability in MatrixSSL could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition.The vulnerability is due to an out-of-bounds read condition that occurs in the affected software during ASN.1 handing. An attacker could exploit this vulnerability by sending a crafted certificate to the targeted system. A successful exploit could cause the targeted system to crash or allow the attacker to execute arbitrary code.The vendor has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must send a crafted certificate to the targeted system, making exploitation difficult in environments that restrict network access from untrusted sources.


  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

Fixed Software

  • The vendor released software updates at the following link: MatrixSSL 4.2.1

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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