What is CVE-2021-3396?

CVE-2021-3396 is a high-severity vulnerability in Opennms Horizon. CVSS score: 8.8/10. Published 2021-02-17.

How severe is CVE-2021-3396?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Opennms Horizon

CVE-2021-3396

OpenNMS Meridian 2016, 2017, 2018 before 2018.1.25, 2019 before 2019.1.16, and 2020 before 2020.1.5, Horizon 1.2 through 27.0.4, and Newts <1.5.3 has Incorrect Access Control, which allows local and remote code execution using JEXL expressions.

Published 2021-02-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

References

www.opennms.com (Vendor Advisory)
www.opennms.com/en/blog/2021-02-16-cve-2021-3396-full-security-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-3396?: CVE-2021-3396 is a high-severity vulnerability in Opennms Horizon. CVSS score: 8.8/10. Published 2021-02-17.
How severe is CVE-2021-3396?: High severity. CVSS v3 base score is 8.8 out of 10.