CVE-2016-8562

KEVSiemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability

Description

An improper privilege management vulnerability exists within the Siemens SIMATIC Communication Processor (CP) that allows a privileged attacker to remotely cause a denial of service.

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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

PublishedNov 18, 2016

Last modifiedJun 17, 2026

Added to KEVMar 3, 2022

Remediation dueMar 24, 2022

References

securityfocus.com/bid/94436Broken LinkThird Party Advisory
siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdfBroken LinkPatch
cert-portal.siemens.com/productcert/pdf/ssa-672373.pdfVendor Advisory
ics-cert.us-cert.gov/advisories/ICSA-16-327-01Third Party AdvisoryUS Government Resource
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-8562US Government Resource

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Risk assessment · High

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1678 days
CVSS: 7.5 HIGH
EPSS (30-day exploit probability): 3.6% · top 11% of all CVEs
Weakness: NVD-CWE-noinfo
Attack vector: Network, remotely reachable

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.