CVE-2021-3737

Updated: 2026-02-25 09:53:29.096791

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.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x HIGH 7.1
CVSS Version 3.x HIGH 7.5

Status

OS name Project name Version Score Severity Status Errata Last updated

Statement

CentOS 8.5 ELS python2 2.7.18 7.5 HIGH Released CLSA-2022:1654526367 2022-06-06 11:47:17
CentOS 8.5 ELS python3 3.6.8 7.5 HIGH Released CLSA-2022:1654010877 2022-05-31 11:38:04
CentOS 8.5 ELS php 7.4.19 7.5 HIGH Not Vulnerable 2025-10-09 15:40:35
CentOS Stream 8 ELS php 7.2.24 7.5 HIGH Not Vulnerable 2025-10-09 15:40:29
CloudLinux 6 ELS python 2.6.6 7.5 HIGH Released CLSA-2022:1647958633 2022-04-07 21:52:18
CloudLinux 7 ELS php 5.4.16 7.5 HIGH Not Vulnerable 2025-10-09 15:40:36
CloudLinux 7 ELS python 2.7.5 7.5 HIGH Released CLSA-2024:1727289167 2024-10-07 10:49:55
CloudLinux 7 ELS python3 3.6.8 7.5 HIGH Released CLSA-2024:1727288754 2024-10-07 10:50:30
Debian 10 ELS php 7.3 7.5 HIGH Not Vulnerable 2026-02-16 23:02:25
Oracle Linux 6 ELS php 5.3.3 7.5 HIGH Not Vulnerable 2025-10-09 15:40:37
Total: 33