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CVE-2021-32837

Good to know:

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Date: January 16, 2023

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.

Language: Python

Severity Score

Related Resources (10)

https://github.com/python-mechanize/mechanize
https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
https://github.com/pypa/advisory-database/tree/main/vulns/mechanize/PYSEC-2023-25.yaml
https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize
https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6
https://nvd.nist.gov/vuln/detail/CVE-2021-32837
https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/
https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879
https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
https://www.mend.io/vulnerability-database/CVE-2021-32837

Severity Score

Weakness Type (CWE)

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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