CVE-2021-3737
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 4, 2022
- Updated
- Oct 14, 2026
- Reserved
- Aug 26, 2021
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop'), CWE-400 - Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
pythonn/a |
|
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 updatemailing-list
- [debian-lts-announce] 20230630 [SECURITY] [DLA 3477-1] python3.7 security updatemailing-list
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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