Python < 3.6.14 / 3.7.11 / 3.8.11 / 3.9.6 DoS

high Nessus Plugin ID 156198


The remote host has an application installed that is affected by a denial of service vulnerability.


A denial of service vulnerability exists in Python 3.6.x < 3.6.14, 3.7.x < 3.7.11, 3.8.x < 3.8.11, and 3.9.x < 3.9.6. If a client performs an HTTP/HTTPS/FTP request against a service controlled by an attacker, the attacker can make this client hang forever, even if the client has set a timeout argument (CVE-2021-3737).

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade Python to 3.6.14, 3.7.11, 3.8.11, 3.9.6 or later.

See Also

Plugin Details

Severity: High

ID: 156198

File Name: python_3_9_6.nasl

Version: 1.5

Type: local

Agent: windows

Family: Windows

Published: 12/20/2021

Updated: 11/22/2023

Configuration: Enable paranoid mode

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2021-3737


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:python:python

Required KB Items: Settings/ParanoidReport, SMB/Registry/Enumerated, installed_sw/Python Software Foundation Python

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/5/2021

Vulnerability Publication Date: 5/3/2021

Reference Information

CVE: CVE-2021-3737

IAVA: 2021-A-0497-S