UBUNTU-CVE-2021-3737 (CVE-2021-3737)

Vulnerability from osv_ubuntu – Published: 2021-08-31 00:00 – Updated: 2026-04-22 07:39 – Source website
VLAI
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"
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    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/pull/26503"
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      "url": "https://github.com/python/cpython/commit/60ba0b68470a584103e28958d91e93a6db37ec92"
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      "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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