CVE-2006-0788
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 · uneditedKyocera 3830 (aka FS-3830N) printers have a back door that allows remote attackers to read and alter configuration settings via strings that begin with "!R!SIOP0", as demonstrated using (1) a connection to to TCP port 9100 or (2) the UNIX lp command.
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 Kyocera 3830 (FS-3830N) printer contains a hardcoded back door that allows remote attackers to read and modify configuration settings by sending specially crafted strings beginning with '!R!SIOP0' to TCP port 9100 (the raw printer port) or via the UNIX lp command. This bypasses authentication and provides full control over device settings.
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 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- Partial
- Availability
- None
AV:N/AC:L/Au:N/C:N/I:P/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 modelCheck the device label or access the printer's web interface/status page to confirm the exact model is Kyocera FS-3830N or FS-3830nAffected if The device is a Kyocera FS-3830N printer (all versions contain the backdoor)
-
Verify TCP port 9100 accessibilityRun a network scan (e.g., nmap -p 910 <target IP> or nc -zv <target IP> 9100) to check if the raw printer port is reachable from untrusted network segmentsAffected if Port 9100 is open and accessible from networks outside the trusted printer administration zone
-
Test for backdoor responseSend the string '!R!SIOP0' followed by any characters to port 9100 (e.g., echo '!R!SIOP0TEST' | nc <printer IP> 9100) and observe if the printer responds or accepts commands without authenticationAffected if The printer accepts and processes commands starting with '!R!SIOP0' without requiring any login credentials
-
Review printer configuration access logsExamine printer logs or network traffic captures for any attempted or successful connections using the raw port 9100 with the backdoor patternAffected if Logs show unauthenticated configuration changes or the specific '!R!SIOP0' pattern in network traffic
If the device is a Kyocera FS-3830N and TCP port 9100 is exposed to untrusted networks, the environment is vulnerable to the backdoor attack.
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 dataIsolate affected printers on a restricted network segment with firewall rules blocking unauthorized access to TCP port 9100 from untrusted networks; verify if firmware updates are available from Kyocera, though this older model may be end-of-life and require replacement.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2006-0788 — 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-2006-0788 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