Zero-Day Advisory

Fortinet Discovers Apache Shiro Authentication Bypass Vulnerability


Fortinet's FortiGuard Labs had discovered an Authentication Bypass vulnerability in Apache Shiro.

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management.

The vulnerability is caused by a specially crafted HTTP request when using Apache Shiro with Spring Boot. Upon successful exploitation, it allows attackers to access arbitrary restricted URI path in the system.


Users should apply the solution provided by Apache Shiro

Additional Information

The vulnerability affected Apache Shiro version before 1.8.0.


Fortinet reported the vulnerability to Apache Shiro on 31st March, 2021.

Apache Shiro confirmed the vulnerability on 16th  April, 2021. 

Apache Shiro  released patch for the vulnerability on 17th September, 2021.


This vulnerability was discovered by Nguyen Thanh Nguyen 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.