CVE-2021-3426

python: Information disclosure via pydoc

Severity Score

5.7

*CVSS v3.1

Exploit Likelihood

< 1%

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.

Se presenta un fallo en pydoc de Python versión 3. Un atacante local o adyacente que descubre o es capaz de convencer a otro usuario local o adyacente para que iniciar un servidor pydoc podría acceder al servidor y usarlo para divulgar información confidencial perteneciente al otro usuario al que normalmente no podría acceder. El mayor riesgo de este fallo es la confidencialidad de los datos. Este fallo afecta a Python versiones anteriores a 3.8.9, Python versiones anteriores a 3.9.3 y Python versiones anteriores a 3.10.0a7

A flaw was found in Python 3's pydoc. This flaw allows a local or adjacent attacker who discovers or can convince another local or adjacent user to start a pydoc server to access the server and then use it to disclose sensitive information belonging to the other user that they would not normally have the ability to access. The highest threat from this vulnerability is to data confidentiality.

Red Hat Advanced Cluster Management for Kubernetes 2.2.10 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console — with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which provide security fixes, bug fixes and container upgrades. Issues addressed include a bypass vulnerability.

*Credits: N/A

CVSS Scores

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-09 CVE Reserved
2021-05-03 CVE Published
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (15)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/0...	Mailing List
https://lists.debian.org/debian-lts-announce/2023/0...	Mailing List
https://security.netapp.com/advisory/ntap-20210629-...	Third Party Advisory

1 - 3 of 3

URL	Date	SRC

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1935913	2021-11-09
https://www.oracle.com/security-alerts/cpujan2022.html	2023-11-07
https://www.oracle.com/security-alerts/cpuoct2021.html	2023-11-07

1 - 3 of 3

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://security.gentoo.org/glsa/202104-04	2023-11-07
https://access.redhat.com/security/cve/CVE-2021-3426	2021-11-09

1 - 9 of 9

Affected Vendors, Products, and Versions (22)

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				< 2.7.18 Search vendor "Python" for product "Python" and version " < 2.7.18"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.6.0 < 3.6.13 Search vendor "Python" for product "Python" and version " >= 3.6.0 < 3.6.13"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.7.0 < 3.7.10 Search vendor "Python" for product "Python" and version " >= 3.7.0 < 3.7.10"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.8.0 < 3.8.8 Search vendor "Python" for product "Python" and version " >= 3.8.0 < 3.8.8"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.9.0 < 3.9.3 Search vendor "Python" for product "Python" and version " >= 3.9.0 < 3.9.3"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.10.0 Search vendor "Python" for product "Python" and version "3.10.0"		alpha1		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.10.0 Search vendor "Python" for product "Python" and version "3.10.0"		alpha2		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.10.0 Search vendor "Python" for product "Python" and version "3.10.0"		alpha3		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.10.0 Search vendor "Python" for product "Python" and version "3.10.0"		alpha4		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.10.0 Search vendor "Python" for product "Python" and version "3.10.0"		alpha5		Affected

1 - 10 of 22