{"cve":"CVE-2013-0340","nvd":{"published":"2014-01-21T18:55:09.117","modified":"2026-10-14T07:16:35.810","status":"Modified","description":"expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue.  NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-611"],"references":["http://openwall.com/lists/oss-security/2013/02/22/3","http://seclists.org/fulldisclosure/2021/Oct/61","http://seclists.org/fulldisclosure/2021/Oct/62","http://seclists.org/fulldisclosure/2021/Oct/63","http://seclists.org/fulldisclosure/2021/Sep/33"],"products":["apple:ipados","apple:iphone_os","apple:macos","apple:tvos","apple:watchos","libexpat_project:libexpat","python:python"],"source":"nvd","synced_at":"2026-10-19T20:32:06.812358378+00:00"},"epss":{"cve":"CVE-2013-0340","score":0.19433,"percentile":0.97344,"date":"2026-10-25"},"kev":null,"osv":[],"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."]}