CVE-2017-12621

Name: CVE-2017-12621
Creator: NVD / NIST
Published: 2017-09-28T01:29:01.293+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 8.54%

Last modified Jun 17, 2026

CVE-2017-12621 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 8.54% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

8.54%

94.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Apache	Commons Jelly	< 1.0.1

References

http://www.securityfocus.com/bid/101052Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039444Third Party Advisory, VDB Entry
https://issues.apache.org/jira/browse/JELLY-293Issue Tracking, Patch, Vendor Advisory
https://lists.apache.org/thread.html/f1fc3f2c45264af44ce782d54b5908ac95f02bf7ad88bb57bfb04b73%40%3Cdev.commons.apache.org%3E
http://www.securityfocus.com/bid/101052Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039444Third Party Advisory, VDB Entry
https://issues.apache.org/jira/browse/JELLY-293Issue Tracking, Patch, Vendor Advisory
https://lists.apache.org/thread.html/f1fc3f2c45264af44ce782d54b5908ac95f02bf7ad88bb57bfb04b73%40%3Cdev.commons.apache.org%3E

Timeline

Published: Sep 28, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-12621?

How severe is CVE-2017-12621?

CVE-2017-12621 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 8.54% probability of exploitation in the next 30 days.

How do I fix CVE-2017-12621?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-12621?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST