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Weekly Signal
Live intelligence Updated 20 Aug 2026 · 23:28 UTC

Siemens · SIMATIC CP, Simatic Cp 1543-1 Firmware, Siplus Net Cp 1543-1 Firmware

CVE-2016-8562

Siemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. Vendor advisory from cert-portal.siemens.com

View response plan
CVSS7.5
EPSS3.6%
KEVYes
ExploitationConfirmed exploitation
RemediationExplicit patch identified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 3.6%; technical severity is CVSS 7.5.

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.

Who should care

  • Teams operating SIMATIC CP, Simatic Cp 1543-1 Firmware, Siplus Net Cp 1543-1 Firmware
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether SIMATIC CP, Simatic Cp 1543-1 Firmware, Siplus Net Cp 1543-1 Firmware is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Vendor advisory from cert-portal.siemens.com
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Patch

Required Action

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20
Affected versions
Siemens SIMATIC CP; Siemens Simatic Cp 1543-1 Firmware (End Excluding 2.0.28); Siemens Siplus Net Cp 1543-1 Firmware (End Excluding 2.0.28)
Fixed versions
Siemens Simatic Cp 1543-1 Firmware (Fixed from 2.0.28); Siemens Siplus Net Cp 1543-1 Firmware (Fixed from 2.0.28)
Published
18 November 2016
Attack vector
Network
Privileges required
Low
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 3.6%
  4. Signal calculated at 66

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.