{"cve":"CVE-2021-32821","nvd":{"published":"2023-01-03T17:15:10.210","modified":"2026-06-17T03:53:42.020","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1333","CWE-400"],"references":["https://securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/","https://securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/"],"products":["mootools:mootools"],"source":"nvd","synced_at":"2026-10-19T21:37:31.370122805+00:00"},"epss":{"cve":"CVE-2021-32821","score":0.00651,"percentile":0.51192,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-v63q-hgqc-qvpg","url":"https://osv.dev/vulnerability/GHSA-v63q-hgqc-qvpg","summary":"MooTools Regular Expression Denial of Service","modified":"2024-04-02T14:41:43.453359Z","packages":[{"ecosystem":"npm","name":"mootools","purl":"pkg:npm/mootools","ranges":["<=1.5.2"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}