# CVE-2017-9946: Auth bypass in APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5

> An attacker with network access can bypass authentication on Siemens BACnet controllers to download sensitive information.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Oct 2017
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-fgqr-7xrp-hhfh

## What is CVE-2017-9946?

CVE-2017-9946 is a high-severity authentication bypass vulnerability in APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5, published on 23 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5. An attacker with network access to the integrated web server (80/tcp and 443/tcp) could bypass the authentication and download sensitive information from the device.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2017-9946?

It affects 4 products.


Products: Siemens Apogee Pxc Firmware, Siemens Apogee Pxc Modular Firmware, Siemens Talon Tc Compact Firmware, Siemens Talon Tc Modular Firmware.

## How do I fix CVE-2017-9946?

No fix has been published for CVE-2017-9946 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-9946 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-9946 exists.

## Other vulnerabilities in APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5

- [CVE-2017-9947](https://insights.sbomify.com/CVE-2017-9947/): Path traversal in APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5 (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-9946 and fix it if it is affected.

What it is: CVE-2017-9946 is a high-severity authentication bypass vulnerability in APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5, published on 23 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-9946 exists.

Affected product: APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5. 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-2017-9946/ (Markdown: https://insights.sbomify.com/CVE-2017-9946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-9946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-9946
- OSV: https://osv.dev/vulnerability/CVE-2017-9946

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-9946/
Summaries are generated and may contain mistakes; the official description above is the record.