ubuntu-cve-2021-3737
Vulnerability from osv_ubuntu
Published
2021-08-31 00:00
Modified
2026-04-22 07:39
Summary
Details

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

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  "aliases": [],
  "details": "A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.",
  "id": "UBUNTU-CVE-2021-3737",
  "modified": "2026-04-22T07:39:48Z",
  "published": "2021-08-31T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3737"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.python.org/issue44022"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/pull/25916"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/pull/26503"
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    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/60ba0b68470a584103e28958d91e93a6db37ec92"
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      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/ea9327036680acc92d9f89eaf6f6a54d2f8d78d9"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/f396864ddfe914531b5856d7bf852808ebfc01ae"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/078b146f062d212919d0ba25e34e658a8234aa63"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/f68d2d69f1da56c2aea1293ecf93ab69a6010ad7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/98e5a7975d99b58d511f171816ecdfb13d5cca18"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/5df4abd6b033a5f1e48945c6988b45e35e76f647"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/0389426fa4af4dfc8b1d7f3f291932d928392d8b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/fee96422e6f0056561cf74fef2012cc066c9db86"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/commit/1b6f4e5e13ebd1f957b47f7415b53d0869bdbac6"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5083-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5199-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5200-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5201-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3737"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6891-1"
    }
  ],
  "related": [
    "USN-5083-1",
    "USN-5199-1",
    "USN-5200-1",
    "USN-5201-1",
    "USN-6891-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3737"
  ]
}



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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.