Open Redirect in Aiohttp
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.019 (78.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Aiohttp
- Aio-Libs Aiohttp — versions < 3.7.4
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg (Third Party Advisory)
- github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b (Patch, Third Party Advisory)
- github.com/aio-libs/aiohttp/blob/master/CHANGES.rst (Third Party Advisory)
- pypi.org/project/aiohttp/ (Product, Third Party Advisory)
- www.debian.org/security/2021/dsa-4864 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202208-19 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21330?
- CVE-2021-21330 is a low-severity vulnerability in Aiohttp, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.1/10. Published 2021-02-26.
- How severe is CVE-2021-21330?
- Low severity. CVSS v3 base score is 3.1 out of 10.
- Is CVE-2021-21330 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.