Description
Restlet Framework before 2.3.12 allows remote attackers to access arbitrary files via a crafted REST API HTTP request that conducts an XXE attack, because only general external entities (not parameter external entities) are properly considered. This is related to XmlRepresentation, DOMRepresentation, SaxRepresentation, and JacksonRepresentation.
Remediation
References
https://github.com/restlet/restlet-framework-java/wiki/XEE-security-enhancements
https://lgtm.com/blog/restlet_CVE-2017-14949
Related Vulnerabilities
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CVE-2020-8214 Vulnerability in npm package servey
CVE-2021-29459 Vulnerability in maven package org.xwiki.platform:xwiki-platform-web
CVE-2020-13934 Vulnerability in maven package org.apache.tomcat:tomcat-coyote