CVE-2017-9858
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 · uneditedAn issue was discovered in SMA Solar Technology products. By sending crafted packets to an inverter and observing the response, active and inactive user accounts can be determined. This aids in further attacks (such as a brute force attack) as one now knows exactly which users exist and which do not. NOTE: the vendor's position is that this "is not a security gap per se." 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 · high confidenceAn information disclosure vulnerability in SMA Solar Technology inverters (Sunny Boy TLST-21, TL-21, Sunny Tripower TL-10, TL-30) allows unauthenticated attackers to enumerate valid user accounts by sending crafted packets and analyzing the responses. This user enumeration significantly reduces the effort required for subsequent brute force attacks against the device's authentication mechanism.
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
- None
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.
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Identify the inverter model and firmware versionAccess the device web interface or check the device labeling/documentation. Look for the model number (e.g., Sunny Boy 3600, Sunny Tripower 15000tl) and note that all firmware versions are affected.Affected if The device is one of: Sunny Boy 3600, Sunny Boy 5000, Sunny Tripower Core1, Sunny Tripower 15000tl, Sunny Tripower 20000tl, Sunny Tripower 25000tl, Sunny Tripower 5000tl, or Sunny Tripower 12000tl.
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Confirm network accessibility of the management interfaceAttempt to access the device web interface on typical ports (80, 443, 8080) from a remote location or verify the device IP is routable from untrusted networks.Affected if The web-based management interface is accessible from networks outside the trusted internal network.
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Test for user enumeration vulnerabilitySend multiple authentication requests with different usernames to the login endpoint and observe the responses. Look for differences in response time, error messages, or HTTP status codes that reveal which usernames are valid.Affected if The device returns distinct responses that differentiate between valid and invalid usernames, allowing an attacker to enumerate existing accounts.
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Review authentication logs for enumeration patternsIf accessible, examine the device logs or syslog exports for repeated authentication attempts with varying usernames, especially from single source IPs.Affected if Logs show patterns of failed login attempts with many different usernames, indicating enumeration activity.
A user is affected if they operate any of the listed SMA inverter models with the management interface exposed to accessible networks, as the vulnerability enables unauthenticated user account enumeration.
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 network segmentation to isolate inverters from untrusted networks, deploy firewall rules to restrict access to management interfaces, and monitor for anomalous authentication patterns. If available, apply vendor firmware updates. Consider implementing account lockout policies and rate limiting on authentication endpoints.
- Consultation4.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2017-9858 — 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-2017-9858 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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- Version or environment caveats, and links to real fixes
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