CVE-2016-8562
HighExploitedPublic exploitUnder 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.
Published Nov 18, 2016 · Updated Apr 21, 2026
Key Facts
Patch immediately- CVE-2016-8562 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Simatic Cp 1543-1 Firmware (Siemens), Siplus Net Cp 1543-1 Firmware (Siemens).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022. Public exploit code is available.
- EPSS estimates a 3.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including Simatic Cp 1543-1 Firmware 2.0.28, Siplus Net Cp 1543-1 Firmware 2.0.28.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.6%
Higher than 89.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2016-8562 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| Industry KEV feed | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| CIRCL KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| ENISA EUVD | Mar 3, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Simatic Cp 1543-1 FirmwareSiemens | See advisory | 2.0.28 |
| Siplus Net Cp 1543-1 FirmwareSiemens | See advisory | 2.0.28 |
Patched Releases
Simatic Cp 1543-1 Firmware
2.0.28
Siplus Net Cp 1543-1 Firmware
2.0.28
Timeline
Publicly disclosed
Nov 18, 2016
Added to CISA KEV
Mar 3, 2022
Added to Industry KEV feed
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Apr 21, 2026
References
- advisoryhttps://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf
- advisoryhttps://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
- advisory94436
- patchhttp://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdf
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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).
Affected: Simatic Cp 1543-1 Firmware (Siemens); Siplus Net Cp 1543-1 Firmware (Siemens). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 24, 2022.
Public exploit code is available.
Fixed versions are available, including Simatic Cp 1543-1 Firmware 2.0.28, Siplus Net Cp 1543-1 Firmware 2.0.28.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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