CVE-2023-27520
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 SEIKO EPSON printers/network interface Web Config allows a remote unauthenticated attacker to hijack the authentication and perform unintended operations by having a logged-in user view a malicious page. [Note] Web Config is the software that allows users to check the status and change the settings of SEIKO EPSON printers/network interface via a web browser. According to SEIKO EPSON CORPORATION, it is also called as Remote Manager in some products. Web Config is pre-installed in some printers/network interface provided by SEIKO EPSON CORPORATION. For the details of the affected product names/model numbers, refer to the information provided by the vendor.
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 SEIKO EPSON's Web Config interface (also called Remote Manager) allows a remote unauthenticated attacker to hijack an authenticated user's session. By tricking a logged-in user into visiting a malicious webpage, the attacker can send unintended requests to the Web Config interface and perform unauthorized operations on the printer or network device.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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.
-
Identify the printer modelAccess the printer's control panel or check the device label to confirm the exact model number (e.g., Lp 9200ps2, Lp 8200c, Lp 9600, etc.) and verify it matches one of the affected models in the CVE listAffected if The model is any of: Lp 9200ps2, Lp 9200ps3, Lp 8200c, Lp 9600, Lp 9600s, Lp 9300, Lp 8500c, or Lp 8700ps3
-
Verify Web Config interface is enabledAccess the printer's network settings or administration panel and check whether the Web Config (also called Remote Manager) web interface is turned on or accessible via HTTP/HTTPSAffected if Web Config/Remote Manager interface is enabled and accessible on the network
-
Check if the device is accessible without authenticationAttempt to access the Web Config login page by entering the printer's IP address in a web browser; note whether the login page loads without requiring prior authenticationAffected if The Web Config login page loads without requiring any existing session or credentials
-
Inspect HTTP responses for CSRF protectionLog into Web Config using a valid account, then use browser developer tools or a proxy to capture HTTP responses when performing a state-changing action (such as changing network settings); examine whether the request includes anti-CSRF tokens or if cookies contain SameSite attributesAffected if State-changing requests lack anti-CSRF tokens in request parameters and cookies do not have SameSite=Strict or SameSite=Lax attributes
-
Confirm active user sessions existCheck if any users have active sessions logged into the Web Config interface, or review access logs for recent authenticated sessionsAffected if Users have active authenticated sessions in Web Config, as the CSRF attack requires a logged-in user to unknowingly trigger the malicious request
If the device model is one of the eight affected Epson models and the Web Config interface is enabled, the device is vulnerable to CSRF attacks that can hijack authenticated user sessions.
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 or SameSite cookie attributes on all state-changing operations within Web Config to validate request authenticity. Coordinate with SEIKO EPSON for device-specific firmware updates and vendor-provided security patches.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-27520 — 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-2023-27520 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data