CVE-2021-21330

Publication date 26 February 2021

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

3.1 · Low

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
python-aiohttp 25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Fixed 3.6.2-1ubuntu0.1~esm1
18.04 LTS bionic
Fixed 3.0.1-1ubuntu0.1~esm1
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release

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Notes

sbeattie

vuln introduced in upstream commit 8c44b2189d24c1c9f94d6733b5038761451fb3bc (v1.3.0)

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
python-aiohttp

Severity score breakdown

Parameter Value
Base score 3.1 · Low
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

References

Related Ubuntu Security Notices (USN)

Other references