What is CVE-2020-13940?

CVE-2020-13940 is a medium-severity vulnerability in Apache Nifi, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2020-10-01.

How severe is CVE-2020-13940?

Medium severity. CVSS v3 base score is 5.5 out of 10.

XXE in Apache Nifi

CVE-2020-13940

In Apache NiFi 1.0.0 to 1.11.4, the notification service manager and various policy authorizer and user group provider objects allowed trusted administrators to inadvertently configure a potentially malicious XML file. The XML file has the ability to make external calls to services (via XXE).

Vulnerability class: XXE (XML External Entity)

EPSS: 0.019 (77.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Apache Nifi
N/a Apache Nifi — versions Apache NiFi 1.0.0 to 1.11.4

Weakness classification (CWE)

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

References

security@apache.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-13940?: CVE-2020-13940 is a medium-severity vulnerability in Apache Nifi, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2020-10-01.
How severe is CVE-2020-13940?: Medium severity. CVSS v3 base score is 5.5 out of 10.