Siemens SICAM Q100 Session Fixation (CVE-2022-43398)

high Tenable OT Security Plugin ID 501069


The remote OT asset is affected by a vulnerability.


A vulnerability has been identified in POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50). Affected devices do not renew the session cookie after login/logout and also accept user defined session cookies. An attacker could overwrite the stored session cookie of a user. After the victim logged in, the attacker is given access to the user's account through the activated session.

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The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at

Siemens released updates for the affected products and recommends updating to V2.50 or a later version.

Siemens identified the following specific workarounds and mitigations users can apply to reduce risk:

- Restrict access to port 443/tcp to trusted IP addresses only

Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can be minimized by virtue of the grid design.

Siemens recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, operators may use an automated means to apply the security updates across multiple product instances. Siemens recommends prior validation of any security update before application and recommends trained staff supervise the update process in the target environment.

As a general security measure, Siemens recommends protecting network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN) and advises configuring the environment according to operational guidelines in order to run the devices in a protected IT environment. Recommended security guidelines can be found at Siemens' website.

For further inquiries on security vulnerabilities in Siemens products and solutions, users should contact Siemens ProductCERT.

For more information, see the associated Siemens security advisory SSA-570294 in HTML and CSAF.

See Also

Plugin Details

Severity: High

ID: 501069

Version: 1.7

Type: remote

Family: Tenable.ot

Published: 4/20/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2022-43398


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:siemens:7kg9501-0aa01-2aa1_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 11/8/2022

Vulnerability Publication Date: 11/8/2022

Reference Information

CVE: CVE-2022-43398

CWE: 384