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)

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.019 (79.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-13940: held from 0.019 to 0.019.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

  • Apache Nifi
  • Apache Nifi — versions Apache NiFi 1.0.0 to 1.11.4

Weakness classification (CWE)

References

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.