---
cve: "CVE-2021-21330"
severity: "LOW"
cvss: 3.1
epss: "1.9%"
vendor: "aio-libs"
kev: false
exploited: false
published: "2021-02-26 03:15:12"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T14:38:41+02:00"
---

# CVE-2021-21330

> 3.1 LOW · 🧪 PoC

## Beschreibung

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In aiohttp before version 3.7.4 there is an open redirect vulnerability. A maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website. It is caused by a bug in the `aiohttp.web_middlewares.normalize_path_middleware` middleware. This security problem has been fixed in 3.7.4. Upgrade your dependency using pip as follows "pip install aiohttp >= 3.7.4". If upgrading is not an option for you, a workaround can be to avoid using `aiohttp.web_middlewares.normalize_path_middleware` in your applications.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 0a26acc1de9e1b0244456b7881ec16ba8bb64fc3 (Commit)
- 2545222a3853e31ace15d87ae0e2effb7da0c96b (Commit)

## Referenzen

- <https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg>
- <https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b>
- <https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25>
- <https://pypi.org/project/aiohttp/>
- <https://www.debian.org/security/2021/dsa-4864>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/>
- <https://security.gentoo.org/glsa/202208-19>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-21330) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_