CVE-2021-3733 (GCVE-0-2021-3733)

Vulnerability from cvelistv5 – Published: 2022-03-07 00:00 – Updated: 2025-11-03 21:45
VLAI?
Summary
There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
Severity ?
No CVSS data available.
CWE
  • CWE-400 - - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
n/a python Affected: Fixed in python v3.6.14, python v3.7.11, python v3.8.10, python v3.9.5.
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Un atacante que controle un servidor HTTP malicioso al que se conecte un cliente HTTP (como un navegador web), podr\u00eda desencadenar una Denegaci\u00f3n de Servicio por Expresi\u00f3n Regular (ReDOS) durante una petici\u00f3n de autenticaci\u00f3n con una carga \u00fatil especialmente dise\u00f1ada que sea enviada por el servidor al cliente. La mayor amenaza que supone este fallo es para la disponibilidad de la 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  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.