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HorizonApplication · Opennms

CVE-2021-25931

HIGH · 8.8 CVSS v3.1 Published 2021-05-20
Fix available
A fix is available. Upgrade to 27.1.1 / 2019.1.19 or later.
See remediation →
95/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In OpenNMS Horizon, versions opennms-1-0-stable through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1; meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.6-1 are vulnerable to CSRF, due to no CSRF protection at `/opennms/admin/userGroupView/users/updateUser`. This flaw allows assigning `ROLE_ADMIN` security role to a normal user. Using this flaw, an attacker can trick the admin user to assign administrator privileges to a normal user by enticing him to click upon an attacker-controlled website.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-352

The application can't tell whether a state-changing request was genuinely intended by the user, so an attacker can trick a logged-in victim's browser into making it. That can transfer funds, change settings, or create accounts silently. Remediation is anti-CSRF tokens — or equivalent same-site protections — on every state-changing request.

General guidance for the cross-site request forgery (csrf) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
HorizonApplication
Affected:>= 1.0, < 27.1.1
MeridianApplication
Affected:>= 2015.1.0, < 2019.1.19>= 2020.1.0, < 2020.1.7

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 27.1.1 / 2019.1.19 / 2020.1.7 or later
Fixed in 27.1.12019.1.192020.1.7
Vendor patch github.com →
Recommended fix High confidence

Horizon: upgrade to 27.1.1; Meridian: upgrade to 2019.1.19 or 2020.1.7 (depending on your branch)

  1. Identify your current OpenNMS product (Horizon or Meridian) and version using system information
  2. For Horizon users: Upgrade to version 27.1.1 or later
  3. For Meridian users: If currently on 2015.1.0-2019.1.18, upgrade to 2019.1.19 or later; if currently on 2020.1.0-2020.1.6, upgrade to 2020.1.7 or later
  4. Follow the standard upgrade documentation for your platform (Linux, Windows, or Kubernetes)
  5. After upgrade, verify the CSRF protection is active by checking that the application sets CSRF tokens on state-changing endpoints
  6. Ensure all administrative actions involving user role assignment now require CSRF validation
Caveat Review Horizon 27.x or Meridian release notes for any configuration or behavioral changes between your current version and the target fixed release

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-25931 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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