Vulnerability Details : CVE-2021-32837
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.
Vulnerability category: Denial of service
Products affected by CVE-2021-32837
- cpe:2.3:a:mechanize_project:mechanize:*:*:*:*:*:python:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-32837
0.27%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 68 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-32837
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2021-32837
-
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-32837
-
https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/
GHSL-2021-108: ReDoS (Regular Expression Denial of Service) in mechanize - CVE-2021-32837 | GitHub Security LabExploit;Third Party Advisory
-
https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
Use the current upstream (python3.9) authreq header parsing regex · python-mechanize/mechanize@dd05334 · GitHubPatch;Third Party Advisory
-
https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6
Release v0.4.6 · python-mechanize/mechanize · GitHubThird Party Advisory
-
https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879
Exploit;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
[SECURITY] [DLA 3460-1] python-mechanize security update
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