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Vulnerability record · CVE-2017-12621 · published 28 September 2017

CVE-2017-12621: Apache commons jelly xml external entity (xxe) vulnerability

Apache · Commons Jelly

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.

9.8 CVSS 3.1 Critical EPSS 7.0% · top 6.0% CWE-611 · XML external entity (XXE)
9.8CVSS 3.1 base score, v2 7.5
7.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/101052 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039444 Third Party AdvisoryVDB Entry
https://issues.apache.org/jira/browse/JELLY-293 Issue TrackingPatchVendor Advisory
https://lists.apache.org/thread.html/f1fc3f2c45264af44ce782d54b5908ac95f02bf7ad88bb57bfb04b73%40%3Cdev.commons.apache.or
http://www.securityfocus.com/bid/101052 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039444 Third Party AdvisoryVDB Entry
https://issues.apache.org/jira/browse/JELLY-293 Issue TrackingPatchVendor Advisory
https://lists.apache.org/thread.html/f1fc3f2c45264af44ce782d54b5908ac95f02bf7ad88bb57bfb04b73%40%3Cdev.commons.apache.or

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Source: NIST National Vulnerability Database (record CVE-2017-12621), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.