---
cve: "CVE-2020-36321"
severity: "MEDIUM"
cvss: 5.9
epss: "1.2%"
vendor: "Vaadin"
kev: false
exploited: false
published: "2021-04-23 16:15:08"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T18:50:28+02:00"
---

# CVE-2020-36321

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin 14.0.0 through 14.4.2), and 3.0 prior to 5.0 (Vaadin 15 prior to 18) allows attacker to request arbitrary files stored outside of intended frontend resources folder.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 4623398d1c6817fb6e7e7ae8d05f54cede9c45ee (Commit)
- 60b4fd8e59948e2a6a5f8af1988a3adc45563ffc (Commit)

## Referenzen

- <https://vaadin.com/security/cve-2020-36321>
- <https://github.com/vaadin/flow/pull/9392>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2020-36321) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_