CVEs-PoC/2021/CVE-2021-28170.md

### [CVE-2021-28170](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28170)
![](https://img.shields.io/static/v1?label=Product&message=Jakarta%20Expression%20Language%20Implementation&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-20%3A%20Improper%20Input%20Validation&color=brightgreen)

### Description

In the Jakarta Expression Language implementation 3.0.3 and earlier, a bug in the ELParserTokenManager enables invalid EL expressions to be evaluated as if they were valid.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpuapr2022.html

#### Github
- https://github.com/scordero1234/java_sec_demo-main