{"affected":[{"affectedData":[{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThan":"117","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"Firefox ESR","vendor":"Mozilla","versions":[{"lessThan":"115.2","status":"affected","version":"unspecified","versionType":"custom"}]},{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThan":"115.2","status":"affected","version":"unspecified","versionType":"custom"}]}],"source":"security@mozilla.org"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","matchCriteriaId":"97397EB0-B9CD-4C1F-B2DC-92F03D4DC61B","versionEndExcluding":"117.0","vulnerable":true},{"criteria":"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*","matchCriteriaId":"3DB778E6-50ED-4395-AFA5-A0043AEB4382","versionEndExcluding":"115.2","vulnerable":true},{"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*","matchCriteriaId":"F88F4161-8C10-4753-BE49-8AE5FB965EE4","versionEndExcluding":"115.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"When `UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2."},{"lang":"es","value":"Cuando `UpdateRegExpStatics` intentó acceder a `initialStringHeap`, es posible que ya se haya recolectado basura antes de ingresar a la función, lo que podría haber provocado un bloqueo explotable. Esta vulnerabilidad afecta a Firefox &lt; 117, Firefox ESR &lt; 115.2 y Thunderbird &lt; 115.2."}],"id":"CVE-2023-4577","lastModified":"2026-06-17T06:38:08.300","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"exploitabilityScore":2.8,"impactScore":3.6,"source":"nvd@nist.gov","type":"Primary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2023-4577","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-09-19T20:02:33.505149Z","version":"2.0.3"}}]},"published":"2023-09-11T09:15:09.287","references":[{"source":"security@mozilla.org","tags":["Issue Tracking","Permissions Required"],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1847397"},{"source":"security@mozilla.org","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-34/"},{"source":"security@mozilla.org","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-36/"},{"source":"security@mozilla.org","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-38/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Issue Tracking","Permissions Required"],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1847397"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-34/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-36/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.mozilla.org/security/advisories/mfsa2023-38/"}],"sourceIdentifier":"security@mozilla.org","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]}