Resource exhaustion in Mootools
CVE-2021-32821
MooTools is a collection of JavaScript utilities for JavaScript developers. All known versions include a CSS selector parser that is vulnerable to Regular Expression Denial of Service (ReDoS). An attack requires that an attacker can inject a string into a CSS selector at runtime, which is quite common with e.g. jQuery CSS selectors. No patches are available for this issue.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Mootools
- Mootools Mootools-Core — versions 1.6.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32821?
- CVE-2021-32821 is a medium-severity vulnerability in Mootools, classified under Uncontrolled Resource Consumption. CVSS score: 6.2/10. Published 2023-01-03.
- How severe is CVE-2021-32821?
- Medium severity. CVSS v3 base score is 6.2 out of 10.
- Is CVE-2021-32821 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.