Is CVE-2021-21330 actively exploited?

CVE-2021-21330 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-21330?

CVE-2021-21330 has a CVSS score of 3.1 (LOW severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

How do I patch CVE-2021-21330?

Patch guidance is available from aiohttp security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-21330.

CVE-2021-21330 - remediation guidance & executive summary

Q: Which products are affected by CVE-2021-21330?

4 products: aiohttp aiohttp, debian debian linux, fedoraproject fedora, fedoraproject fedora.

Description

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 Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: high
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-601 CWE-601

Metadata

Primary Vendor: AIOHTTP
Published: 2/26/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

aiohttp : aiohttpdebian : debian_linuxfedoraproject : fedorafedoraproject : fedora

Remediation Guidance

Executive Summary

Cite this page

CVE-2021-21330. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2021-21330

View on NIST NVD

CVE-2021-21330 vulnerability