CVE-2021-3396Network attack vector

Authenticated code execution via unsandboxed JEXL evaluation

Published Feb 17, 2021 · Updated Aug 3, 2024

Code injection in OpenNMS Meridian, Horizon, and Newts allows remote authenticated users to execute code through crafted JEXL expressions. Multiple Measurements API, Provisiond, JMX monitor, thresholding, reporting, storage, and Newts API paths evaluated attacker-controlled expressions with an unrestricted JEXL2 engine instead of a class allowlist. Access to a local command or authenticated remote interface is required, and successful execution runs in the affected service context.

CVSS severity8.8
High
EPSS probability2.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in OpenNMS Meridian, Horizon, and Newts allows remote authenticated users to execute code through crafted JEXL expressions. Multiple Measurements API, Provisiond, JMX monitor, thresholding, reporting, storage, and Newts API paths evaluated attacker-controlled expressions with an unrestricted JEXL2 engine instead of a class allowlist. Access to a local command or authenticated remote interface is required, and successful execution runs in the affected service context.

The record

CVE
CVE-2021-3396
Published
Feb 17, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4The OpenNMS GroupCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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