VDB-175418 · CVE-2021-3426 · EUVD-2021-26753

Python up to 3.8.8/3.9.2/3.10.0a6 pydoc information disclosure

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.5	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Python up to 3.8.8/3.9.2/3.10.0a6. Affected by this issue is some unknown functionality of the component pydoc. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2021-3426. The attack must be carried out from within the local network. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Python up to 3.8.8/3.9.2/3.10.0a6 (Programming Language Software). It has been rated as problematic. Affected by this issue is an unknown code block of the component pydoc. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality.

The weakness was presented 05/21/2021. The advisory is available at bugzilla.redhat.com. This vulnerability is handled as CVE-2021-3426. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 211991 (Debian dla-3980 : idle-python3.9 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.8.9, 3.9.3 or 3.10.0a7 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (211991) and EUVD (EUVD-2021-26753). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Programming Language Software

Name

Python

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.7
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 211991
Nessus Name: Debian dla-3980 : idle-python3.9 - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Python 3.8.9/3.9.3/3.10.0a7

Timelineinfo

03/09/2021 🔍
05/21/2021 +72 days 🔍
05/21/2021 +0 days 🔍
12/18/2025 +1672 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-3426 (🔍)
GCVE (CVE): GCVE-0-2021-3426
GCVE (VulDB): GCVE-100-175418
EUVD: 🔍

Entryinfo

Created: 05/21/2021 07:07
Updated: 12/18/2025 13:13
Changes: 05/21/2021 07:07 (39), 05/23/2021 09:04 (2), 12/02/2024 17:07 (16), 11/04/2025 05:42 (19), 12/18/2025 13:13 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.