# CVE-2016-8562: Siemens SIMATIC CP 1543-1 Improper Privilege Management

> Attackers can write to read-only SNMP variables on Siemens SIMATIC CP devices, potentially causing denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 3 Mar 2022 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2016
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-f87x-hp4c-9cvw

## What is CVE-2016-8562?

CVE-2016-8562 is a high-severity missing authorization vulnerability in n/a, published on 18 Nov 2016. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

## Which versions are affected by CVE-2016-8562?

It affects 2 products.


Products: Siemens Simatic Cp 1543-1 Firmware, Siemens Siplus Net Cp 1543-1 Firmware.

## How do I fix CVE-2016-8562?

No fix has been published for CVE-2016-8562 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Mar 2022.

## Is CVE-2016-8562 being exploited?

Yes. Attackers have exploited CVE-2016-8562 in the wild since at least 3 Mar 2022.

## Other vulnerabilities in n/a

- [CVE-2024-50310](https://insights.sbomify.com/CVE-2024-50310/): Missing authorization in SIMATIC CP 1543-1 V4.0 (high 8.7)
- [CVE-2016-8561](https://insights.sbomify.com/CVE-2016-8561/): Privilege escalation in n/a (medium 6.6)
- [CVE-2021-33716](https://insights.sbomify.com/CVE-2021-33716/): Information disclosure in SIMATIC CP 1543-1 (incl. SIPLUS variants) (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-8562 and fix it if it is affected.

What it is: CVE-2016-8562 is a high-severity missing authorization vulnerability in n/a, published on 18 Nov 2016. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2016-8562 in the wild since at least 3 Mar 2022.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2016-8562/ (Markdown: https://insights.sbomify.com/CVE-2016-8562/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-8562
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-8562
- OSV: https://osv.dev/vulnerability/CVE-2016-8562

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-8562/
Summaries are generated and may contain mistakes; the official description above is the record.