{"cve":"CVE-2021-4305","nvd":{"published":"2023-01-05T11:15:09.120","modified":"2026-06-17T04:19:28.147","status":"Modified","description":"A vulnerability was found in Woorank robots-txt-guard. It has been rated as problematic. Affected by this issue is the function makePathPattern of the file lib/patterns.js. The manipulation of the argument pattern leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. The name of the patch is c03827cd2f9933619c23894ce7c98401ea824020. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-217448.","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"],"references":["https://github.com/Woorank/robots-txt-guard/commit/c03827cd2f9933619c23894ce7c98401ea824020","https://github.com/Woorank/robots-txt-guard/pull/4","https://vuldb.com/?ctiid.217448","https://vuldb.com/?id.217448","https://github.com/Woorank/robots-txt-guard/commit/c03827cd2f9933619c23894ce7c98401ea824020"],"products":["bridgeline:robots-txt-guard"],"source":"nvd","synced_at":"2026-10-19T21:37:34.931465858+00:00"},"epss":{"cve":"CVE-2021-4305","score":0.0099,"percentile":0.62533,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-6g33-8w2q-4hxv","url":"https://osv.dev/vulnerability/GHSA-6g33-8w2q-4hxv","summary":"robots-txt-guard Inefficient Regular Expression Complexity vulnerability","modified":"2023-11-08T04:07:08.423714Z","packages":[{"ecosystem":"npm","name":"robots-txt-guard","purl":"pkg:npm/robots-txt-guard","ranges":["<1.0.2"],"fixed":["1.0.2"]}]}],"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."]}