FasterXML jackson-databind logback-core Class Polymorphic Deserialization Vulnerability [CVE-2019-12384]

CVE number – CVE-2019-12384

A vulnerability in the FasterXML jackson-databind library could allow an unauthenticated, remote attacker to perform unauthorized actions on a targeted system. The vulnerability exists because the affected software fails to block the logback-core class from polymorphic deserialization. An attacker could exploit this vulnerability by sending a request that submits malicious input to the targeted system.

A successful exploit could allow the attacker to perform unauthorized actions on the system and potentially execute arbitrary code or cause a denial of service (DoS) condition. FasterXML has confirmed the vulnerability and released a software patch.


  • To exploit this vulnerability, the attacker must send a request to the targeted system, which may require access to trusted, internal networks. This access limitation may reduce the likelihood of a successful exploit.


  • 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

  • FasterXML has released a bug report and release notes at the following links: Bug #2334

Fixed Software

Jason Davies

UK based technology professional, with an interest in computer security and telecoms.

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