The vulnerability CVE-2017-18214 explicitly references a ReDoS issue in the 'moment' library's date parsing logic. The GitHub commit diff shows critical modifications to the 'matchWord' regex in three files, including src/lib/parse/regex.js. The original regex used unbounded quantifiers (e.g., [0-9]* and +), which are classic indicators of ReDoS vulnerabilities. The patch introduced quantifier limits (e.g., {0,256} and {1,256}) to restrict input size. Since 'matchWord' is directly used in parsing date strings, its pre-patch form was the root cause of the vulnerability. No other functions are explicitly mentioned in the provided context, but the regex itself is the clearly identified vulnerable component.