CVE-2017-12621: Apache Commons Jelly

Critical severity, CVSS 9.8. EPSS: 8.1% chance of exploitation in the next 30 days.

During Jelly (xml) file parsing with Apache Xerces, if a custom doctype entity is declared with a "SYSTEM" entity with a URL and that entity is used in the body of the Jelly file, during parser instantiation the parser will attempt to connect to said URL. This could lead to XML External Entity (XXE) attacks in Apache Commons Jelly before 1.0.1.

Affected products

• Apache Commons Jelly: before 1.0.1 (fixed in 1.0.1)

Published 2017-09-28. Last modified 2026-06-17.