Siemens LOGO! Soft Comfort up to 8.1 Integrity Verification data authenticity

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Siemens LOGO! Soft Comfort up to 8.1. It has been declared as critical. This vulnerability affects some unknown functionality of the component Integrity Verification. The manipulation with an unknown input leads to a data authenticity vulnerability. The CWE definition for the vulnerability is CWE-345. The software does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Siemens LOGO! Soft Comfort (All versions before V8.2) lacks integrity verification of software packages downloaded via an unprotected communication channel. This could allow a remote attacker to manipulate the software package while performing a Man-in-the-Middle (MitM) attack.

The bug was discovered 12/19/2017. The weakness was disclosed 12/26/2017 (Website). The advisory is available at This vulnerability was named CVE-2017-12740 since 08/09/2017. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 8.2 eliminates this vulnerability.





  • commercial

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Data authenticity
CWE: CWE-345
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: LOGO! Soft Comfort 8.2


08/09/2017 🔍
12/19/2017 +132 days 🔍
12/25/2017 +6 days 🔍
12/26/2017 +1 days 🔍
12/26/2017 +0 days 🔍
01/19/2023 +1850 days 🔍



Advisory: ssa-888929
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-12740 (🔍)


Created: 12/26/2017 09:07 AM
Updated: 01/19/2023 07:10 AM
Changes: 12/26/2017 09:07 AM (59), 12/17/2019 05:56 PM (2), 01/19/2023 07:10 AM (4)
Complete: 🔍


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