CVE-2026-23767
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 · uneditedESC/POS, a printer control language designed by Seiko Epson Corporation, lacks mechanisms for user authentication and command authorization, does not provide controls to restrict sources or destinations of network communication, and transmits commands without encryption or integrity protection.
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 confidenceESC/POS printer command language lacks fundamental security mechanisms including user authentication, command authorization, network communication controls, and encryption/integrity protection. This allows any network-adjacent attacker to send arbitrary printer commands, intercept traffic, or modify commands in transit.
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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 network-connected Epson printersScan your network for devices with manufacturer OUI matching Epson (typically 00:26:AB or similar) and service ports 9100, 80, or 443 open, or manually inspect printer inventory records for models: Sb H50, Tm H6000v, Tm L100, Tm M10, Tm M30, Tm M30ii, Tm M30ii H, Tm M30ii SAffected if Any of the listed Epson printer models are present on your network
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Verify printer network accessibilityCheck if the printer IP address is reachable from network segments that contain untrusted or guest devices, or test with a port scan from an untrusted network segmentAffected if The printer is reachable from network segments beyond the trusted print server or administrative VLAN
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Check network segmentation statusReview VLAN configuration or firewall rules to determine if the printer is isolated in a dedicated VLAN or has access control lists restricting communication to only authorized print server IPsAffected if No VLAN isolation or firewall rules restrict printer access to specific authorized systems
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Confirm no VPN or encrypted tunnel is in useVerify that print traffic is not encapsulated within a VPN tunnel or other encrypted channel by inspecting network paths between print clients and the printerAffected if Print traffic traverses the network in plain text without encryption or tunnel protection
You are affected if any of the listed Epson printer models are network-accessible from segments outside your trusted print infrastructure without VLAN isolation, firewall rules, or VPN tunneling protecting the communication.
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 dataDeploy network segmentation (VLANs) to isolate printers, implement strict firewall rules limiting printer access to authorized systems, and consider VPN tunneling or dedicated network paths for print traffic to compensate for the protocol's inherent lack of security.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-23767 — 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-2026-23767 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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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