CVE-2025-58801
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 · uneditedCross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.
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 · moderate confidenceCross-Site Request Forgery (CSRF) vulnerability in KCS Responder allows attackers to induce authenticated users to perform unintended actions. The affected application lacks proper anti-CSRF tokens or SameSite cookie protections on state-changing operations, enabling malicious requests to be forged from other sites.
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
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
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 KCS Responder installationLocate the KCS Responder application files and determine the installed version by checking version files, application headers, or the About/Help sections within the web interfaceAffected if KCS Responder is present without a known patch for this CSRF vulnerability
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Inspect state-changing forms for anti-CSRF tokensUse browser developer tools or a web proxy to capture requests from state-changing forms such as settings, configuration, or user management. Examine whether each form includes a hidden anti-CSRF token field that is submitted with the requestAffected if State-changing forms are missing anti-CSRF token fields or the tokens are not validated on submission
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Verify SameSite cookie attributesIn browser developer tools, inspect the session cookies set by KCS Responder under the Application or Storage tab. Check the Set-Cookie headers or individual cookie properties for the SameSite attributeAffected if Session cookies lack the SameSite attribute or are set to SameSite=None without the Secure flag
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Check Origin/Referer header validationCapture a state-changing request and replay it using a tool like curl with modified or missing Origin/Referer headers. Observe whether the application accepts or rejects the requestAffected if The application processes state-changing requests without validating Origin or Referer headers, accepting requests from arbitrary origins
A user is affected if KCS Responder is running and any state-changing operation lacks anti-CSRF token validation or uses session cookies without proper SameSite 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.
From vendor dataImplement anti-CSRF tokens on all state-changing forms and validate the Origin/Referer headers. Additionally, configure session cookies with the SameSite=Strict or SameSite=Lax attribute.
- Consultation3.0 h
- Implementation6.0 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-2025-58801 — 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-2025-58801 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
- No weaponised exploit code, or anything meant to cause harm
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