Zero-Day Advisory

Fortinet Discovers Oracle Java Runtime Environment Memory Corruption Vulnerability


Fortinet's FortiGuard Labs has discovered a memory corruption vulnerability in Oracle Java Runtime Environment.

Java Platform, Standard Edition (Java SE) lets you develop and deploy Java applications on desktops and servers. Java offers the rich user interface, performance, versatility, portability, and security that today's applications require.

A memory corruption vulnerability exists in 2D sub-component of Oracle Java SE through 8u211, during TTF font rendering in LigatureSubstitutionSubtable class. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE.


User should apply the patch from Oracle.


Fortinet reported the vulnerability to Oracle on 21 June, 2019

Oracle confirmed the vulnerability on 04 July, 2019

Oracle patched the vulnerability in main codeline on 24 July, 2019

Oracle released patch for the vulnerability on 16 Oct, 2019


This vulnerability was discovered by Tin Duong of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.