CVE-2020-12511
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 · uneditedPepperl+Fuchs Comtrol IO-Link Master in Version 1.5.48 and below is prone to a Cross-Site Request Forgery (CSRF) in the web interface.
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 confidenceCross-Site Request Forgery (CSRF) vulnerability in the web interface of Pepperl+Fuchs Comtrol IO-Link Master devices version 1.5.48 and below allows attackers to induce authenticated users to perform unintended state-changing actions via malicious requests.
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<= 1.5.48<= 1.5.48<= 1.5.48<= 1.5.48<= 1.5.48<= 1.5.48<= 1.5.48<= 1.5.48CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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 device model and firmware versionAccess the web interface or use the device's management console to locate the firmware version information. Look for the specific IO-Link Master model (4 Eip, 8 Eip, 8 Eip L, Dr 8 Eip variants, 4 Pnio, 8 Pnio) and its current firmware revision.Affected if The device firmware version is 1.5.48 or lower, matching one of the listed affected product models.
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Confirm web interface is enabledAttempt to access the device web interface via HTTP/HTTPS on the typical management port (usually port 80 or 443, or a vendor-assigned port). Verify the login page or status page loads successfully.Affected if The web interface is accessible and functional, as CSRF attacks require the web interface to be enabled.
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Inspect form submissions for anti-CSRF tokensLog into the web interface and use browser developer tools (Network tab) to capture a form submission or state-changing request (such as configuration changes). Examine the request parameters for a unique token value that changes per session.Affected if No anti-CSRF token or similar unique request identifier is present in state-changing form submissions, indicating vulnerability.
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Check session cookie SameSite attributeWith browser developer tools, inspect the session cookies set by the web interface. Look for the Set-Cookie header or cookie details to verify if the SameSite attribute is configured.Affected if Session cookies lack the SameSite attribute or are set without it, indicating missing CSRF mitigation.
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Test for CSRF vulnerabilityUsing a separate browser session (or burp suite/repeater), attempt to replay a captured state-changing request without the anti-CSRF token. If the request succeeds without token validation, the device is vulnerable.Affected if State-changing operations execute successfully without requiring a valid anti-CSRF token, confirming the vulnerability exists.
A user is affected if they are running any of the listed Pepperl+Fuchs IO-Link Master models with firmware version 1.5.48 or lower and the web interface lacks anti-CSRF token protection on state-changing operations.
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 for all form submissions and state-changing operations in the web interface, and configure session cookies with SameSite attributes to prevent cross-origin requests.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-12511 — 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-2020-12511 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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