CVE-2023-40313: A BeanShell interpreter in remote server mode runs in OpenMNS Horizon versions earlier than 32.0.2 and in rela

Routine

HIGH 7.1UPGRADEUPGRADE

CVE-2023-40313 is a high-severity flaw (CVSS 7.1) affecting horizon, meridian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A BeanShell interpreter in remote server mode runs in OpenMNS Horizon versions earlier than 32.0.2 and in related Meridian versions which could allow arbitrary remote Java code execution. The solution is to upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-94
Published	2023-08-17
Last modified	2026-06-17

Publisher (CNA): The OpenNMS Group · Vendor: opennms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-17 19:15 UTCPublished CVE record published
2026-06-17 06:17 UTCUpdated Record last modified

opennms horizon UPGRADE

Affected: < 32.0.2

Fixed in: 32.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy horizon || rpm -q horizon || horizon --version

2. UPGRADE to 32.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade horizon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade horizon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

opennms meridian UPGRADE

Affected: < 2020.1.38 · >= 2021.1.0 and < 2021.1.30 · >= 2022.1.0 and < 2022.1.19 · >= 2023.1.0 and < 2023.1.6

Fixed in: 2020.1.38, 2021.1.30, 2022.1.19, 2023.1.6

Safe to downgrade to: a release before 2021.1.0

1. Check installed version

apt-cache policy meridian || rpm -q meridian || meridian --version

2. UPGRADE to 2020.1.38 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade meridian

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade meridian

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2021.1.0 (Debian / Ubuntu)

apt-cache madison meridian sudo apt install meridian=<VERSION_BEFORE_2021.1.0> sudo apt-mark hold meridian

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list meridian sudo dnf downgrade meridian-<VERSION_BEFORE_2021.1.0> sudo dnf versionlock add meridian

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-40313?

horizon: upgrade to 32.0.2; meridian: upgrade to 2020.1.38, 2021.1.30, 2022.1.19, 2023.1.6. Exact commands for each OS are on this page.

Is CVE-2023-40313 being exploited?

CVE-2023-40313 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-40313 affect?

CVE-2023-40313 affects horizon, meridian. Severity is high (CVSS 7.1). A BeanShell interpreter in remote server mode runs in OpenMNS Horizon versions earlier than 32.0.2 and in related Meridian versions which could allow arbitrary remote Java code execution. The solution is to upgrade to Meridian 2023.1.6, 202

How urgent is CVE-2023-40313?

Priority 39/100. High severity

Software pages

Java vulnerabilities

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References

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