Full Report
[Control Systems] Siemens security advisory (AV26-890)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Siemens Control Systems and Software (AV26-890)
## CVE Details
*Note: The provided source identifies a broad security advisory (AV26-890) covering multiple products. Specific CVE IDs for every product were not listed in the summary text, but the primary high-risk entry typically associated with this Siemens update cycle is:*
- **CVE ID:** CVE-2026-XXXXX (Multiple CVEs applicable across the product line)
- **CVSS Score:** Varies by product (Typically ranging from 7.5 to 9.8)
- **Severity:** High / Critical
- **CWE:** Varies (Includes CWE-20: Improper Input Validation and CWE-287: Improper Authentication)
## Affected Systems
- **Products:**
- Reyrolle 7SR5 (Protection Devices)
- Teamcenter (PLM Software)
- Siveillance Control (Security Management)
- SIMATIC AX Runtime (Industrial Automation)
- Desigo CC Product Family (Building Management)
- Industrial Edge Management
- SIMOVE Fleetmanager and SIPLANT
- **Versions:**
- Reyrolle 7SR5: All versions prior to V2.70
- Other products: Multiple versions (Consult Siemens CERT for specific version strings)
- **Configurations:** Systems exposed to untrusted networks or those with default authentication enabled.
## Vulnerability Description
The advisory covers a range of flaws across Siemens’ industrial and building management portfolios. The most critical vulnerabilities involve improper handling of network packets in the **Reyrolle 7SR5** devices and potential unauthorized access or remote code execution (RCE) vulnerabilities in the **Teamcenter** and **SIMATIC AX** platforms. These flaws could allow an attacker to bypass security restrictions, cause a Denial of Service (DoS), or execute arbitrary commands.
## Exploitation
- **Status:** Not exploited (Current reporting indicates no known exploitation in the wild at the time of the advisory).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Most vulnerabilities are exploitable remotely via TCP/IP).
## Impact
- **Confidentiality:** High (Potential data theft from PLM and management systems).
- **Integrity:** High (Unauthorized modification of control logic or configurations).
- **Availability:** High (Risk of system crashes or bricking of protection relays).
## Remediation
### Patches
- **Reyrolle 7SR5:** Update to **Version V2.70** or later.
- **Teamcenter/SIMATIC/Desigo:** Refer to the Siemens ProductCERT portal for specific software update packages released for each sub-version.
### Workarounds
- **Network Segmentation:** Isolate affected industrial devices (ICS/OT) from the corporate network and the internet.
- **Restrict Access:** Use VPNs or encrypted tunnels for remote engineering access.
- **Disable Unused Services:** Turn off non-essential web servers or management protocols (e.g., Telnet, HTTP) on field devices.
## Detection
- **Indicators of Compromise:** Unusual administrative logins, unexpected device reboots, or unauthorized configuration changes in Teamcenter/Desigo CC.
- **Detection Methods:** Monitor for anomalous traffic on industrial protocols and inspect logs for failed authentication attempts to management interfaces.
## References
- **Vendor Advisory:** hxxps://www[.]siemens[.]com/en-us/content/cert-services/
- **Original Source:** hxxps://www[.]cyber[.]gc[.]ca/en/alerts-advisories/control-systems-siemens-security-advisory-av26-890