Security readout for executives and security teams
Plain-English summary
CVE-2021-25930 is a CSRF flaw in OpenNMS user management. If an authenticated user can be tricked into taking an action, a user rename operation can overwrite privileges and remove the old user entry. The published impact is integrity-only and rated medium.
Executive priority
Treat as a moderate operational risk for OpenNMS environments. Prioritize remediation where OpenNMS manages critical monitoring workflows or its console is broadly reachable.
Technical view
OpenNMS Horizon through 27.1.0-1 and specified Meridian 2015, 2019, and 2020 ranges lack CSRF protection and do not validate an existing username during user rename. The result can overwrite the renamed user’s privileges and delete the old user from the user list.
Likely exposure
Exposure is limited to organizations running the listed OpenNMS Horizon or Meridian versions, especially where the web console is reachable by users who browse external content.
Exploitation context
The CVE requires user interaction and network access. The source bundle does not show CISA KEV listing or other evidence of active exploitation in the wild.
Researcher notes
The record is specific about affected version ranges and root cause, but the bundle does not provide full advisory details, exploit telemetry, or a named fixed release version.
Mitigation direction
- Inventory OpenNMS Horizon and Meridian versions against the affected ranges.
- Review OpenNMS vendor guidance and upgrade to a fixed, supported release.
- Confirm deployed builds include the referenced OpenNMS fix commits where applicable.
- Restrict OpenNMS administrative access to trusted networks and users.
- Review user accounts and privileges for unexpected rename or deletion activity.
Validation and detection
- Check whether any deployed version falls within the affected Horizon or Meridian ranges.
- Verify the user rename flow has CSRF protection in the deployed build.
- Review OpenNMS account lists for unexpected deleted, renamed, or privilege-changed users.
- Check administrative logs for unusual user-management actions around exposure windows.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-25930 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25930CVE reference · x_refsource_MISC
- https://github.com/OpenNMS/opennms/commit/607151ea8f90212a3fb37c977fa57c7d58d26a84CVE reference · x_refsource_MISC
- https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98cCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.