mechanize up to 0.4.5 redos

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability was found in mechanize up to 0.4.5. It has been rated as problematic. This affects an unknown part. This manipulation causes redos. The identification of this vulnerability is CVE-2021-32837. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in mechanize up to 0.4.5. It has been declared as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.

The weakness was shared 01/18/2023 as GHSL-2021-108. The advisory is shared at securitylab.github.com. This vulnerability is known as CVE-2021-32837 since 05/12/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1449.003 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 223931 (Linux Distros Unpatched Vulnerability : CVE-2021-32837), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.4.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch dd05334448e9f39814bab044d2eaa5ef69b410d6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (223931) and EUVD (EUVD-2023-0144). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

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

Exploitinginfo

Class: Redos
CWE: CWE-1333 / 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: 223931
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-32837

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mechanize 0.4.6
Patch: dd05334448e9f39814bab044d2eaa5ef69b410d6

Timelineinfo

05/12/2021 🔍
01/18/2023 +616 days 🔍
01/18/2023 +0 days 🔍
12/22/2025 +1069 days 🔍

Sourcesinfo

Advisory: GHSL-2021-108
Status: Confirmed

CVE: CVE-2021-32837 (🔍)
GCVE (CVE): GCVE-0-2021-32837
GCVE (VulDB): GCVE-100-218869
EUVD: 🔍

Entryinfo

Created: 01/18/2023 08:18
Updated: 12/22/2025 05:03
Changes: 01/18/2023 08:18 (51), 03/05/2025 11:00 (17), 12/22/2025 03:24 (12), 12/22/2025 05:03 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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