What is CVE-2021-41042?

CVE-2021-41042 is a medium-severity vulnerability in Eclipse Lyo, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.3/10. Published 2022-07-07.

How severe is CVE-2021-41042?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-41042 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XXE in Eclipse Lyo

CVE-2021-41042

In Eclipse Lyo versions 1.0.0 to 4.1.0, a TransformerFactory is initialized with the defaults that do not restrict DTD loading when working with RDF/XML. This allows an attacker to cause an external DTD to be retrieved.

Vulnerability class: XXE (XML External Entity)

Published 2022-07-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Eclipse Lyo
The Eclipse Foundation Lyo — versions 1.0.0, unspecified

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

gitlab.eclipse.org/eclipsefdn/emo-team/emo/-/issues/287 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2021-41042?: CVE-2021-41042 is a medium-severity vulnerability in Eclipse Lyo, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.3/10. Published 2022-07-07.
How severe is CVE-2021-41042?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-41042 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.