CVE-2021-21330 (GCVE-0-2021-21330)

Vulnerability from cvelistv5 – Published: 2021-02-26 02:15 – Updated: 2024-08-03 18:09
VLAI
Title
Open redirect vulnerability in aiohttp
Summary
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.
Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
Impacted products
Vendor Product Version
aio-libs aiohttp Affected: < 3.7.4
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:04:12+00:00",
      "cve": "CVE-2021-21330",
      "id": "CVE-2021-21330",
      "initial_release_date": "2021-02-25T00:00:00+00:00",
      "product_status:fixed": "2",
      "product_status:known_not_affected": "1511",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "python-aiohttp: Open redirect in aiohttp.web_middlewares.normalize_path_middleware",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-21330.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-03-27T11:02:12Z",
      "cve": "CVE-2021-21330",
      "id": "CVE-2021-21330",
      "initial_release_date": "2023-02-15T03:46:22Z",
      "product_status:recommended": "126",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-21330",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-21330.json",
      "version": "14"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.