What’s Vulnerable › Vulnerabilities

CVE-2016-8562: Siemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-03-03
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-11-18 · updated 2026-06-17

Description

A vulnerability has been identified in SIMATIC CP 1543-1 (All versions < V2.0.28), SIPLUS NET CP 1543-1 (All versions < V2.0.28). Under special conditions it was possible to write SNMP variables on port 161/udp which should be read-only and should only be configured with TIA-Portal. A write to these variables could reduce the availability or cause a denial-of-service.

Affected products

• Siemens SIMATIC CP 1543-1 V4.0: before 2.0.28 — fixed in 2.0.28
• Siemens Siplus Net Cp 1543-1 Firmware: before 2.0.28 — fixed in 2.0.28

How to fix

Upgrade to a fixed version: Siemens SIMATIC CP 1543-1 V4.0 2.0.28; Siemens Siplus Net Cp 1543-1 Firmware 2.0.28. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/94436
• http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf
• https://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
• http://www.securityfocus.com/bid/94436
• http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf
• https://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-8562

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