Sg200 50 FirmwareOperating system · Cisco
CVE-2018-15439
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 · uneditedA vulnerability in the Cisco Small Business Switches software could allow an unauthenticated, remote attacker to bypass the user authentication mechanism of an affected device. The vulnerability exists because under specific circumstances, the affected software enables a privileged user account without notifying administrators of the system. An attacker could exploit this vulnerability by using this account to log in to an affected device and execute commands with full admin rights. Cisco has not released software updates that address this vulnerability. This advisory will be updated with fixed software information once fixed software becomes available. There is a workaround to address this vulnerability.
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 confidenceA vulnerability in Cisco Small Business Switches software allows an unauthenticated remote attacker to bypass user authentication by exploiting a condition where the software enables a privileged user account without administrator notification, granting the attacker full administrative access to the affected 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 data
Sg200 50 FirmwareOperating system
all versions
Sg200 50p FirmwareOperating system
all versions
Sg200 50fp FirmwareOperating system
all versions
Sg200 26 FirmwareOperating system
all versions
Sg200 26p FirmwareOperating system
all versions
Sg200 26fp FirmwareOperating system
all versions
Sg200 18 FirmwareOperating system
all versions
Sg200 10fp FirmwareOperating system
all 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 device modelAccess the switch management interface or use CDP/LLDP discovery to confirm the device is a Cisco SG200 series switch (models 50, 50p, 50fp, 26, 26p, 26fp, 18, or 10fp).Affected if The device is any of these eight SG200 models.
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Verify firmware versionNavigate to the switch web interface or use CLI to check the firmware version (typically found in Status or Administration > Firmware Upgrade).Affected if All firmware versions of the affected models are vulnerable.
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Audit privileged user accountsLog into the switch administration panel and navigate to Administration > User Accounts to review all accounts with Administrative or Privileged access. Compare against documented legitimate accounts.Affected if Any unexpected or unauthorized account with Administrator or Privilege level access exists.
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Review account-related logsCheck the switch logs (typically in Monitoring > Logs or similar) for events related to user account creation, password changes, or privilege modifications.Affected if Logs show account creation or privilege changes that were not performed by legitimate administrators.
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Assess management interface exposureDetermine if the switch management interface (HTTP/HTTPS for web UI or SSH for CLI) is accessible from untrusted networks or the internet.Affected if Management interface is reachable from untrusted networks, enabling remote exploitation.
If the device is a Cisco SG200 model and has an unauthorized privileged account or suspicious account-related log entries, the environment is likely affected by this vulnerability.
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 dataSince no patch is available, implement the Cisco-provided workaround (typically involves disabling the vulnerable feature or restricting management access) and regularly audit for unauthorized privileged accounts.
Fix this in Sg200 50 Firmware
Scoped from the published advisory
- 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-2018-15439 — 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-2018-15439 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
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