CVE-2025-6523
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 · uneditedUse of weak credentials in emergency authentication component in Devolutions Server allows an unauthenticated attacker to bypass authentication via brute forcing the short emergency codes generated by the server within a feasible timeframe. This issue affects the following versions : * Devolutions Server 2025.2.2.0 through 2025.2.3.0 * Devolutions Server 2025.1.11.0 and earlier
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 emergency authentication component in Devolutions Server uses short emergency codes that are susceptible to brute force attacks due to insufficient code complexity and lack of rate limiting. An unauthenticated remote attacker can systematically guess these codes within a feasible timeframe, successfully bypassing all normal authentication controls.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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<= 2025.1.11.0>= 2025.2.2.0, < 2025.2.4.0CVSS 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
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/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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Identify Devolutions Server installation and versionCheck the installed version of Devolutions Server by examining the application itself, typically accessible through the Devolutions Server management interface, or by querying the service information on the host where it is installed.Affected if The installed version is either 2025.1.11.0 or earlier, or falls within 2025.2.2.0 through 2025.2.3.x
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Verify emergency authentication feature is accessibleConfirm that the emergency authentication endpoint is accessible on the Devolutions Server instance, typically accessible via the login page or a dedicated emergency access URL.Affected if Emergency authentication is enabled and reachable from the network where an unauthenticated attacker could attempt code guessing
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Check rate limiting on authentication endpointsInspect the Devolutions Server configuration or web server settings (IIS, nginx, or built-in settings) to determine if rate limiting or account lockout policies are enforced on the authentication endpoints.Affected if No rate limiting, account lockout, or IP blocking is configured on the emergency authentication endpoint
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Review emergency code configurationExamine the emergency authentication settings within the Devolutions Server administration panel to verify the code length and complexity settings configured for emergency codes.Affected if Emergency codes are configured with short length or low complexity (few characters, numeric only, or limited character set)
A user is affected if Devolutions Server is running a version within the affected range (2025.1.11.0 or earlier, or 2025.2.2.0 through 2025.2.3.x) and the emergency authentication feature is enabled and accessible without adequate rate limiting protections.
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.
dbcve · scoped2025.2.4.0
Apply the vendor-provided security update for Devolutions Server to address the weak emergency code generation. As an interim control, implement network-level rate limiting or IP blocking on the authentication endpoint and consider temporarily disabling the emergency authentication feature if not required.
2025.2.4.0 or later (or 2025.1.12.0+ for the 2025.1.x branch)
- Download the latest Devolutions Server version 2025.2.4.0 or later from the official Devolutions download center at devolutions.net
- Review the release notes for version 2025.2.4.0 to understand any changes or migration requirements
- Backup the current Devolutions Server database and configuration
- Stop the Devolutions Server service before upgrading
- Install version 2025.2.4.0 (or latest stable version) using the official installer
- Start the Devolutions Server service after installation
- Verify the emergency authentication has been updated by checking the server configuration
- Test that the emergency authentication now uses sufficiently long/strong codes that are resistant to brute force attacks
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-6523 — 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-2025-6523 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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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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