CVE-2021-21330

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.

• CWE-601
• CWE-601

• https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25Third Party Advisory
• https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96bPatch, Third Party Advisory
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjgThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/
• https://pypi.org/project/aiohttp/Product, Third Party Advisory
• https://security.gentoo.org/glsa/202208-19Third Party Advisory
• https://www.debian.org/security/2021/dsa-4864Third Party Advisory
• https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25Third Party Advisory
• https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96bPatch, Third Party Advisory
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjgThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/
• https://pypi.org/project/aiohttp/Product, Third Party Advisory
• https://security.gentoo.org/glsa/202208-19Third Party Advisory
• https://www.debian.org/security/2021/dsa-4864Third Party Advisory

Published

Feb 26, 2021

Last Modified

Jun 17, 2026

Status

Modified

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