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CVE-2021-3737

Published: Mar 4, 2022

Modified: Dec 17, 2025

PUBLISHED

Description

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.

Vendor	Product	Versions
n/a	python	affected `Fixed in python v3.6.14, python v3.7.11, python v3.8.11, python v3.9.6, python v3.10.0b2`

Weaknesses (CWE)

References

https://bugs.python.org/issue44022

https://github.com/python/cpython/pull/25916

https://bugzilla.redhat.com/show_bug.cgi?id=1995162

https://github.com/python/cpython/pull/26503

https://ubuntu.com/security/CVE-2021-3737

https://www.oracle.com/security-alerts/cpujul2022.html

https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html

https://security.netapp.com/advisory/ntap-20220407-0009/

[debian-lts-announce] 20230524 [SECURITY] [DLA 3432-1] python2.7 security update

mailing-list

[debian-lts-announce] 20230630 [SECURITY] [DLA 3477-1] python3.7 security update

mailing-list

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