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

Vulnerability from cvelistv5 – Published: 2021-05-20 00:00 – Updated: 2025-12-18 11:45
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
5.7 (Medium)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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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\"https://bugzilla.redhat.com/show_bug.cgi?id=1935913\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210629-0003/\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2022.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html\", \"name\": \"[debian-lts-announce] 20230630 [SECURITY] [DLA 3477-1] python3.7 security update\", \"tags\": [\"mailing-list\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2023-06-30T00:00:00.000Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-3426\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:45:56.551Z\", \"dateReserved\": \"2021-03-09T00:00:00.000Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2021-05-20T00:00:00.000Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
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.