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CVE-2023-0871

An XML External Entity injection vulnerability

MEDIUM
6.1
CVSS Score
Published: August 11, 2023 at 04:13 PM UTC
Updated: June 17, 2026 at 05:26 AM UTC
2 products affected across 1 vendorMeridianHorizon

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Horizon· Opennms
95%
31.0.8 ≤ v < 32.0.232.0.0 ≤ v < 32.0.231.0.8
Affected range stops below 32.0.2, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 31.0.8 (unknown)
Meridian· Opennms
95%
2020.0.0 ≤ v < 2020.1.382021.0.0 ≤ v < 2021.1.302022.0.0 ≤ v < 2022.1.192022.1.0 ≤ v < 2022.1.92023.0.0 ≤ v < 2023.1.62020.0.02021.0.02022.0.02023.0.0
Affected range stops below 2020.1.38, so it looks safe — our inference, not a vendor statement
Affected range stops below 2021.1.30, so it looks safe — our inference, not a vendor statement
Affected range stops below 2022.1.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 2022.1.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 2023.1.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Release Notes
Source: [email protected]
https://docs.opennms.com/horizon/32/releasenotes/changelog.html
Patch
Source: [email protected]
https://github.com/OpenNMS/opennms/pull/6355

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-611

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