CVE-2021-3426 (GCVE-0-2021-3426)

Vulnerability from cvelistv5 – Published: 2021-05-20 00:00 – Updated: 2025-11-03 21:44
VLAI?
Summary
There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.
Severity ?
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a python Affected: python 3.8.9, python 3.9.3, python 3.10.0a7
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      "published": "2021-05-20T13:15:07.753",
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      "sourceIdentifier": "secalert@redhat.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"secalert@redhat.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-200\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-22\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-3426\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2021-05-20T13:15:07.753\",\"lastModified\":\"2025-11-03T22:15:50.480\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"There\u0027s a flaw in Python 3\u0027s pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.\"},{\"lang\":\"es\",\"value\":\"Se presenta un fallo en pydoc de Python versi\u00f3n 3.\u0026#xa0;Un atacante local o adyacente que descubre o es capaz de convencer a otro usuario local o adyacente para que iniciar un servidor pydoc podr\u00eda acceder al servidor y usarlo para divulgar informaci\u00f3n confidencial perteneciente al otro usuario al que normalmente no podr\u00eda acceder.\u0026#xa0;El mayor riesgo de este fallo es la confidencialidad de los datos.\u0026#xa0;Este fallo afecta a Python versiones anteriores a 3.8.9, Python versiones anteriores a 3.9.3 y Python versiones anteriores a 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  }
}


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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.