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Sunny ExplorerApplication · Sma

CVE-2017-9851

HIGH · 7.5 CVSS v3.0 Published 2017-08-05
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
An issue was discovered in SMA Solar Technology products. By sending nonsense data or setting up a TELNET session to the database port of Sunny Explorer, the application can be crashed. NOTE: the vendor reports that the maximum possible damage is a communication failure. Also, only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected

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 confidence

This is a denial-of-service vulnerability in SMA Solar Technology's Sunny Explorer application. An attacker can crash the application by sending malformed data to the database port or establishing a TELNET session to that port. The vulnerability affects Sunny Boy TLST-21, TL-21, and Sunny Tripower TL-10, TL-30 inverters running the Sunny Explorer software.

MitigationApply any available vendor patches for Sunny Explorer, or implement network segmentation/firewall rules to restrict access to the database port. Consider disabling TELNET if not required for operations.

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
Sunny ExplorerApplication
Affected:all versions

CVSS 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
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Sunny Explorer software is in use
    Identify if the SMA Sunny Explorer application is installed or running on the system. Check installed programs on Windows or look for sunnyexplorer processes on the device.
    Affected if The Sunny Explorer software is present and running on a Sunny Boy TLST-21, TL-21, or Sunny Tripower TL-10, TL-30 inverter system.
  2. Identify the database port configuration
    Determine which port the Sunny Explorer database service is configured to use. Check the application's configuration files or network listening services on the system.
    Affected if The database port is exposed to the network and accepts external connections.
  3. Verify if the database port is network-accessible
    Scan or check network connectivity to the database port from external systems. Use network scanning tools or verify firewall rules allowing inbound access to the database port.
    Affected if The database port is reachable from untrusted network segments or the internet.
  4. Check if TELNET service is enabled on the affected port
    Determine if TELNET server functionality is enabled for the port used by Sunny Explorer. Check service configurations or attempt a TELNET connection to the port.
    Affected if TELNET is enabled and accessible on the database port, allowing an attacker to establish a session and trigger the crash.
  5. Confirm the inverter model
    Identify the specific inverter model running Sunny Explorer. Check the device label, management interface, or system documentation.
    Affected if The inverter is a Sunny Boy TLST-21, TL-21, or Sunny Tripower TL-10, TL-30 model.

A user is affected if they are running Sunny Explorer software on any of the specified inverter models (TLST-21, TL-21, TL-10, TL-30) with an exposed database port or enabled TELNET service on that port.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply any available vendor patches for Sunny Explorer, or implement network segmentation/firewall rules to restrict access to the database port. Consider disabling TELNET if not required for operations.

Fix this in Sunny Explorer Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2017-9851 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
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  • Version or environment caveats, and links to real fixes
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