# CVE-2021-3396: OpenNMS Horizon RCE via JEXL2 expression

Source: https://junglewise.ai/threats/cve-2021-3396-opennms-horizon-rce-via-jexl2-expression  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-24  
License: CC BY 4.0 with a link back

CVE-2021-3396 · Severity: low · CVSS 3.1 · Published 2022-05-24

OpenNMS Horizon RCE via JEXL2 expression

Technologies: [org.opennms:opennms (Maven)](https://junglewise.ai/threats/technologies/org-opennms-opennms). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2021-3396 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-3396 being exploited in the wild.

**How severe is CVE-2021-3396?** Low severity, with a CVSS score of 3.1, published 24 May 2022.

**Which products and versions are affected?** org.opennms:opennms (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4; org.opennms:opennms-provision (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4; org.opennms:opennms-util (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4; org.opennms.features:org.opennms.features.measurements (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4.

**Is there a fix for CVE-2021-3396?** Yes. org.opennms:opennms (Maven): upgrade to 27.0.4 or later; org.opennms:opennms-provision (Maven): upgrade to 27.0.4 or later; org.opennms:opennms-util (Maven): upgrade to 27.0.4 or later; org.opennms.features:org.opennms.features.measurements (Maven): upgrade to 27.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-3396?** Check whether you run org.opennms:opennms (Maven), org.opennms:opennms-provision (Maven), org.opennms:opennms-util (Maven) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.opennms:opennms (Maven): upgrade to 27.0.4 or later

  ```sh
  # set org.opennms:opennms to 27.0.4 in your pom.xml or build.gradle
  ```

- org.opennms:opennms-provision (Maven): upgrade to 27.0.4 or later

  ```sh
  # set org.opennms:opennms-provision to 27.0.4 in your pom.xml or build.gradle
  ```

- org.opennms:opennms-util (Maven): upgrade to 27.0.4 or later

  ```sh
  # set org.opennms:opennms-util to 27.0.4 in your pom.xml or build.gradle
  ```

- org.opennms.features:org.opennms.features.measurements (Maven): upgrade to 27.0.4 or later

  ```sh
  # set org.opennms.features:org.opennms.features.measurements to 27.0.4 in your pom.xml or build.gradle
  ```


## Affected products

- org.opennms:opennms (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4
- org.opennms:opennms-provision (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4
- org.opennms:opennms-util (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4
- org.opennms.features:org.opennms.features.measurements (Maven) ECOSYSTEM:introduced=16.0.0,fixed=27.0.4

## Identifiers

- CVE-2021-3396
- GHSA-c3mp-9vx3-2rvv

## Related threats

- [OpenNMS Meridian and Horizon vulnerable to Cross-site Scripting](https://junglewise.ai/threats/cve-2023-0867-opennms-meridian-and-horizon-vulnerable-to-cross-site-scripting)
- [OpenNMS has potential Insertion of Sensitive Information into Log File vulnerability](https://junglewise.ai/threats/cve-2023-0815-opennms-has-potential-insertion-of-sensitive-information-into-log)
- [OpenNMS Horizon and Meridian vulnerable to Cross-site Scripting](https://junglewise.ai/threats/cve-2023-0846-opennms-horizon-and-meridian-vulnerable-to-cross-site-scripting)
- [OpenNMS Horizon vulnerable to XSS](https://junglewise.ai/threats/cve-2021-25934-opennms-horizon-vulnerable-to-xss)
- [Cross-site Scripting in OpenNMS Horizon](https://junglewise.ai/threats/cve-2021-25933-cross-site-scripting-in-opennms-horizon)