Is CVE-2023-0871 actively exploited?

No active exploitation of CVE-2023-0871 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-0871 be exploited remotely?

Partially. CVE-2023-0871 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2023-0871?

CVE-2023-0871 has a CVSS score of 6.1 (MEDIUM).

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MEDIUM

CVE-2023-0871

CWE-611Published: August 11, 2023· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-0871 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.