Python urllib AbstractBasicAuthHandler resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Python. It has been rated as problematic. Affected by this issue is the function AbstractBasicAuthHandler of the component urllib. This manipulation causes resource consumption. This vulnerability is registered as CVE-2021-3733. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic was found in Python (Programming Language Software) (version unknown). Affected by this vulnerability is the function AbstractBasicAuthHandler of the component urllib. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability.

The weakness was published 03/11/2022. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-3733 since 08/23/2021. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

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.

Applying the patch 7215d1ae25525c92b026166f9d5cac85fb is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (211991). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 7215d1ae25525c92b026166f9d5cac85fb

Timelineinfo

08/23/2021 🔍
03/11/2022 +200 days 🔍
03/11/2022 +0 days 🔍
11/04/2025 +1334 days 🔍

Sourcesinfo

Advisory: 7215d1ae25525c92b026166f9d5cac85fb
Status: Confirmed

CVE: CVE-2021-3733 (🔍)
GCVE (CVE): GCVE-0-2021-3733
GCVE (VulDB): GCVE-100-194635

Entryinfo

Created: 03/11/2022 09:28
Updated: 11/04/2025 12:56
Changes: 03/11/2022 09:28 (40), 03/13/2022 13:51 (2), 03/13/2022 13:56 (1), 12/02/2024 17:07 (16), 11/04/2025 12:56 (19)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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