CVE-2025-27256
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 · uneditedMissing Authentication for Critical Function vulnerability in GE Vernova Enervista UR Setup application allows Authentication Bypass due to a missing SSH server authentication. Since the client connection is not authenticated, an attacker may perform a man-in-the-middle attack on the network.
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 confidenceThe GE Vernova Enervista UR Setup application contains a missing authentication vulnerability in its SSH server implementation. The application fails to authenticate the SSH server during client connections, allowing an unauthenticated attacker to intercept communications through a man-in-the-middle attack. This authentication bypass affects the critical SSH communication channel used for device configuration and management.
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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
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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Identify if Enervista UR Setup is installedCheck for the presence of the GE Vernova Enervista UR Setup application in the system (typically found in Program Files or installation directories on Windows systems where the software is deployed)Affected if The application is installed and the SSH server component is in use
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Locate the SSH server configurationSearch for SSH server configuration files or settings within the Enervista UR Setup installation directory, looking for SSH daemon or server-related config filesAffected if SSH server configuration exists and is enabled
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Check for host keys or certificatesExamine the SSH server configuration for the presence and proper configuration of host keys (such as ssh_host_rsa_key, ssh_host_ecdsa_key) or certificate filesAffected if No host keys or certificates are defined or they are missing from the SSH server configuration
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Verify SSH client verification settingsReview SSH client configuration or connection settings to determine whether server identity verification (host key verification) is enabled or enforcedAffected if Clients are configured to connect without verifying the server's identity or host key
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Test SSH connection for MITM vulnerabilityAttempt an SSH connection from a client to the Enervista UR Setup SSH server and inspect whether the server presents a valid host key that the client can verifyAffected if The SSH server does not present a verifiable host key or the client accepts connections without host key verification
The environment is affected if the Enervista UR Setup application is installed with its SSH server component enabled and the server fails to present authenticated host keys or certificates to connecting clients, allowing MITM attacks.
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 dataImplement proper SSH server authentication using validated host keys or certificates to prevent man-in-the-middle attacks. Ensure SSH connections verify the server identity before establishing encrypted sessions, and consider network segmentation to limit exposure of the Enervista UR Setup service.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27256 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
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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