What is CVE-2018-1000644?

CVE-2018-1000644 is a critical-severity vulnerability in Eclipse Rdf4j, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 10.0/10. Published 2018-08-20.

How severe is CVE-2018-1000644?

Critical severity. CVSS v3 base score is 10.0 out of 10.

XXE in Eclipse Rdf4j

CVE-2018-1000644

Eclipse RDF4j version < 2.4.0 Milestone 2 contains a XML External Entity (XXE) vulnerability in RDF4j XML parser parsing RDF files that can result in the disclosure of confidential data, denial of service, server side request forgery, port scanning. This attack appear to be exploitable via Specially crafted RDF file.

Vulnerability class: XXE (XML External Entity)

Published 2018-08-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.8th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Eclipse Rdf4j — versions 2.4.0

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

github.com/eclipse/rdf4j/issues/1056 (Patch, Third Party Advisory)
0dd.zone/2018/08/05/rdf4j-XXE/ (Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000644?: CVE-2018-1000644 is a critical-severity vulnerability in Eclipse Rdf4j, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 10.0/10. Published 2018-08-20.
How severe is CVE-2018-1000644?: Critical severity. CVSS v3 base score is 10.0 out of 10.