7.5
HIGH
CVE-2021-32837
Mechanize ReDoS Attacks Crashes Web Server
Description

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.

INFO

Published Date :

Jan. 17, 2023, 10:15 p.m.

Last Modified :

June 20, 2023, 5:15 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-32837 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mechanize_project mechanize
References to Advisories, Solutions, and Tools

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-32837 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-32837 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Jun. 20, 2023

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 25, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 No Types Assigned https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 Exploit, Third Party Advisory
    Changed Reference Type https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 No Types Assigned https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 Patch, Third Party Advisory
    Changed Reference Type https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 No Types Assigned https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 Third Party Advisory
    Changed Reference Type https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/ No Types Assigned https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/ Exploit, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:mechanize_project:mechanize:*:*:*:*:*:python:*:* versions up to (excluding) 0.4.6
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-32837 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-32837 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.27 }} 0.04%

score

0.68338

percentile

CVSS31 - Vulnerability Scoring System
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