HAProxy Transport Layer Security Ticket Key Rotation Vulnerability [CVE-2019-11323]

CVE Number – CVE-2019-11323

A vulnerability in HAProxy could allow an unauthenticated, remote attacker to bypass security restrictions on a targeted system. The vulnerability exists because the affected software does not properly handle Transport Layer Security (TLS) rotated ticket keys. An attacker could exploit this vulnerability by sending a request that submits malicious input to the affected software. A successful exploit could allow the attacker to bypass security restrictions on the targeted system. HAProxy has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, an attacker must send a request that submits malicious input to the targeted system, making exploitation more 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

  • HAProxy has released software updates at the following link: HAProxy 1.9.7

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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