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CVE-2023-0871· NVD / CVE Program· CNA OpenNMS

An XML External Entity injection vulnerability

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.54% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: The OpenNMS Group Horizon 32.0.2; The OpenNMS Group Meridian 2020.1.38, 2021.1.30, 2022.1.19.

Low priority for now. Upgrade to The OpenNMS Group Horizon 32.0.2; The OpenNMS Group Meridian 2020.1.38, 2021.1.30, 2022.1.19 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

XXE injection in /rtc/post/ endpoint in OpenMNS Horizon 31.0.8 and versions earlier than 32.0.2 on multiple platforms is vulnerable to XML external entity (XXE) injection, which can be used for instance to force Horizon to make arbitrary HTTP requests to internal and external services. 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 directly accessible from the Internet. OpenNMS thanks Erik Wynter and Moshe Apelbaum for reporting this issue.

MediumCVSS 6.1 · v3.1—No exploit Fix available
Published
Aug 11, 2023
Updated
Jun 17, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.1
CNA · OpenNMS
5.4
0.7 point gap

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-0871

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opennmshorizon
opennmsmeridian

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • opennms horizon32.0.0 and later · before 32.0.2
  • opennms horizon31.0.8
  • opennms meridian2020.0.0 and later · before 2020.1.38
  • opennms meridian2021.0.0 and later · before 2021.1.30
  • opennms meridian2022.1.0 and later · before 2022.1.9
  • opennms meridian2023.0.0 and later · before 2023.1.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (OpenNMS). Independent of NVD's CPE analysis and usually ahead of it.

  • The OpenNMS Group Horizon

    • 31.0.8 and later · before 32.0.2affected · maven
    • before 31.0.8unknown · maven

  • The OpenNMS Group Meridian

    • 2023.0.0 and later · before 2023.1.6affected · maven
    • 2022.0.0 and later · before 2022.1.19affected · maven
    • 2021.0.0 and later · before 2021.1.30affected · maven
    • 2020.0.0 and later · before 2020.1.38affected · maven

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.opennms.core:org.opennms.core.xmlfrom 31.0.8 · before 32.0.232.0.2

Same product

opennms: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-3396OpenNMS 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 <
    36Monitor
  • CVE-2023-40313Disable BeanShell Interpreter Remote Server Mode
    35Monitor
  • CVE-2021-25931In OpenNMS Horizon, versions opennms-1-0-stable through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through
    35Monitor
  • CVE-2023-40315ROLE_FILESYSTEM_EDITOR Can Be Used To Escalate To ROLE_ADMIN
    33Monitor
  • CVE-2023-0872ROLE_REST can be used to escalate to ROLE_ADMIN via /rest/users
    33Monitor
  • CVE-2023-40612Authenticated XXE Injection Via The File Editor
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
The OpenNMS Group Horizon32.0.2Vendor (CNA)
The OpenNMS Group Meridian2020.1.38Vendor (CNA)
The OpenNMS Group Meridian2021.1.30Vendor (CNA)
The OpenNMS Group Meridian2022.1.19Vendor (CNA)
The OpenNMS Group Meridian2023.1.6Vendor (CNA)
Maven:org.opennms.core:org.opennms.core.xml32.0.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-611 · Improper Restriction of XML External Entity Reference

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records