FKIE_CVE-2021-21330

Vulnerability from fkie_nvd - Published: 2021-02-26 03:15 - Updated: 2026-06-17 03:35
Severity
3.1 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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.
References
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25Third Party Advisory
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96bPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjgThird Party Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/
security-advisories@github.comhttps://pypi.org/project/aiohttp/Product, Third Party Advisory
security-advisories@github.comhttps://security.gentoo.org/glsa/202208-19Third Party Advisory
security-advisories@github.comhttps://www.debian.org/security/2021/dsa-4864Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96bPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjgThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/
af854a3a-2127-422b-91ae-364da2661108https://pypi.org/project/aiohttp/Product, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202208-19Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4864Third Party Advisory
Impacted products
Vendor Product Version
aiohttp aiohttp *
debian debian_linux 10.0
fedoraproject fedora 33
fedoraproject fedora 34
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "aiohttp",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.7.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 \u003e= 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."
    },
    {
      "lang": "es",
      "value": "aiohttp es un framework cliente/servidor HTTP asincr\u00f3nico para asyncio y Python.\u0026#xa0;En aiohttp versiones anteriores a 3.7.4, se presenta una vulnerabilidad de redireccionamiento abierto.\u0026#xa0;Un enlace dise\u00f1ado malicioso en un servidor web basado en aiohttp podr\u00eda redireccionar el navegador a un sitio web diferente.\u0026#xa0;Es causado por un error en el middleware \"aiohttp.web_middlewares.normalize_path_middleware\".\u0026#xa0;Este problema de seguridad ha sido corregido en versi\u00f3n 3.7.4.\u0026#xa0;Actualice su dependencia usando pip de la siguiente manera \"pip install aiohttp versiones posteriores o incluyendo a 3.7.4\".\u0026#xa0;Si la actualizaci\u00f3n no es una opci\u00f3n para usted, una soluci\u00f3n alternativa puede ser evitar el uso de \"aiohttp.web_middlewares.normalize_path_middleware\" en sus aplicaciones"
    }
  ],
  "id": "CVE-2021-21330",
  "lastModified": "2026-06-17T03:35:18.640",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.1,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
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          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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        "source": "nvd@nist.gov",
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  "published": "2021-02-26T03:15:12.840",
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    }
  ]
}



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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.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.