CVE-2025-42611
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 · uneditedRouterOS provides various services that rely on correct verification of client and server certificates to secure confidentiality and integrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X), among others. The vulnerability lies in shared certificate validation logic which uses the system certificate store that is shared and equally trusted by all system services. This causes confusion of scope, allowing any certificate authority present in the system-wide trust store to be trusted in any context (with some exceptions), allowing partial or full authentication bypass in CAPsMAN, OpenVPN, Dot1X and potentially others.
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 · high confidenceRouterOS has a scope confusion vulnerability in its shared certificate validation logic. The system-wide certificate store is used uniformly across multiple services (OpenVPN, CAPsMAN, Dot1X), allowing any CA present in the shared trust store to be trusted regardless of the service context. This enables authentication bypass by leveraging CAs that should only be valid for specific services.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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List all certificates in RouterOSRun `/certificate print` in RouterOS terminal to display all certificates in the system certificate storeAffected if Multiple CA certificates exist in the store, especially where some are intended for specific services only
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Check running services using certificatesRun `/ip service print` and `/interface bridge print` (for CAPsMAN) to identify if OpenVPN, CAPsMAN, or Dot1X services are active and configuredAffected if Any of these services are enabled and configured to use certificate authentication
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Verify OpenVPN certificate configurationRun `/interface ovpn-server server print` to check if `auth` and `cipher` settings include certificate-based authenticationAffected if OpenVPN server is enabled with certificate authentication and multiple CAs exist in the store
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Verify CAPsMAN certificate configurationRun `/caps-man manager print` and `/caps-man configuration print` to check if CAPsMAN is configured with certificate-based access controlAffected if CAPsMAN is enabled with certificate authentication and multiple CAs exist in the store
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Verify Dot1X certificate configurationRun `/interface bridge port` and check for Dot1X settings via `/interface dot1x` to see if certificate authentication is configured on bridge portsAffected if Dot1X is configured with certificate authentication and multiple CAs exist in the store
You are affected if your RouterOS system has multiple CA certificates in its shared certificate store while any of OpenVPN, CAPsMAN, or Dot1X services are configured to use certificate authentication, because CAs intended for one service can be abused to authenticate to another.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataSeparate certificate trust stores per service to ensure each service (OpenVPN, CAPsMAN, Dot1X) only trusts the CAs intended for its specific context, preventing cross-service trust abuse.
- Consultation8.0 h
- Implementation24.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $14,080.
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Free · runs locallyCheck whether your project pulls in CVE-2025-42611 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-42611 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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