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Exploited vulnerability · CISA KEV

Is CVE-2016-8562 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Siemens SIMATIC CP · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-8562, Siemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 1931 days after it was published. It affects Siemens SIMATIC CP. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity7.5CVSS 3.1 · high
US federal due24 Mar 2022BOD 22-01 deadline

What it is

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.

VendorSiemens (2 exploited CVEs in KEV)
ProductSIMATIC CP
VulnerabilitySiemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability
WeaknessCWE-20
Published18 Nov 2016
Added to KEV3 Mar 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for SIMATIC CP in your asset inventory, including appliances and cloud images. Stack check lists every exploited Siemens CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 18 Nov 2016.
  4. Get told next time. Email alerts when CISA adds a CVE for Siemens.

References

Questions

Is CVE-2016-8562 being exploited?

Yes. CISA added CVE-2016-8562 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-8562 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2016-8562?

Apply updates per vendor instructions. Check Siemens's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SIMATIC CP and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Siemens scorecard · act-now radar.

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