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.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-2808-1 python3.5 security update
Debian DLA Debian DLA DLA-3432-1 python2.7 security update
Debian DLA Debian DLA DLA-3477-1 python3.7 security update
Debian DLA Debian DLA DLA-3966-1 pypy3 security update
Debian DLA Debian DLA DLA-3980-1 python3.9 security update
EUVD EUVD EUVD-2021-27013 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.
Ubuntu USN Ubuntu USN USN-5083-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-5199-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-5200-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-5201-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-6891-1 Python vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 17 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 03 Nov 2025 22:30:00 +0000


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-12-17T21:32:47.732Z

Reserved: 2021-08-26T00:00:00.000Z

Link: CVE-2021-3737

cve-icon Vulnrichment

Updated: 2025-11-03T21:45:09.305Z

cve-icon NVD

Status : Modified

Published: 2022-03-04T19:15:08.730

Modified: 2025-12-17T22:15:56.970

Link: CVE-2021-3737

cve-icon Redhat

Severity : Low

Publid Date: 2021-08-09T00:00:00Z

Links: CVE-2021-3737 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses