Threats / Siemens / CVE-2016-8562
CVE-2016-8562
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Siemens SIMATIC CP vulnerability
Improper privilege management in Siemens SIMATIC CP allows a privileged attacker to remotely cause denial of service.
Verdict
Today item — known-exploited.
A privileged attacker can exploit improper privilege management in SIMATIC Communication Processor to remotely trigger a denial of service condition, disrupting industrial control system availability.
CISA KEV Yes · 2022-03-034EPSS 0.03624 (verify live)5CVSS 7.5 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
1 independent public report of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03).
Probability (EPSS)
EPSS 0.03624 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) · Affected: Siemens, SIMATIC CP. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-20 Improper Input Validation.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 1931 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I gain or already possess privileged access to the SIMATIC CP system.
Business
An insider or compromised account with elevated permissions exists within the control system environment.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the privilege management flaw to execute a remote denial of service attack against the CP.
Business
The communication processor becomes unavailable, halting critical industrial process control and data exchange.
3
Lateral reach — past segmentation narrative 3
Attacker
I maintain the denial of service state or repeat the attack to sustain operational disruption.
Business
Production lines, manufacturing processes, or critical infrastructure dependent on SIMATIC CP remain offline, causing financial loss and operational impact.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05