cve/2021/CVE-2021-31403.md

### [CVE-2021-31403](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31403)
![](https://img.shields.io/static/v1?label=Product&message=Vaadin&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=vaadin-server&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%207.0.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-208%20Information%20Exposure%20Through%20Timing%20Discrepancy&color=brighgreen)

### Description

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/Dzmitry-Basiachenka/dist-foreign-aliakh