What’s Vulnerable › Vulnerabilities

CVE-2021-32821: Regular expression Denial of Service in MooTools

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-01-03 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• mootools-core: through 1.6.0

References

• https://securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/
• https://securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/

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