# CVE-2017-16723: Cross-site scripting in PHOENIX CONTACT FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH

> Cross-site scripting in PHOENIX CONTACT serial servers allows remote code execution, requiring firmware upgrades for industrial network security.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Dec 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2m88-g87r-c599

## What is CVE-2017-16723?

CVE-2017-16723 is a medium-severity cross-site scripting vulnerability in PHOENIX CONTACT FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH, published on 11 Dec 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A Cross-site Scripting issue was discovered in PHOENIX CONTACT FL COMSERVER BASIC 232/422/485, FL COMSERVER UNI 232/422/485, FL COMSERVER BAS 232/422/485-T, FL COMSERVER UNI 232/422/485-T, FL COM SERVER RS232, FL COM SERVER RS485, and PSI-MODEM/ETH (running firmware versions prior to 1.99, 2.20, or 2.40). The cross-site scripting vulnerability has been identified, which may allow remote code execution.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2017-16723?

It affects 13 products.


Products: Phoenixcontact Fl Com Server Rs232 Firmware, Phoenixcontact Fl Com Server Rs485 Firmware, Phoenixcontact Fl Comserver Bas 232 Firmware, Phoenixcontact Fl Comserver Bas 422 Firmware, Phoenixcontact Fl Comserver Bas 485-T Firmware, Phoenixcontact Fl Comserver Basic 232 Firmware, Phoenixcontact Fl Comserver Basic 422 Firmware, Phoenixcontact Fl Comserver Basic 485 Firmware, Phoenixcontact Fl Comserver Uni 232 Firmware, Phoenixcontact Fl Comserver Uni 422 Firmware, Phoenixcontact Fl Comserver Uni 485-T Firmware, Phoenixcontact Fl Comserver Uni 485 Firmware, Phoenixcontact Psi-Modem\/Eth Firmware.

## How do I fix CVE-2017-16723?

No fix has been published for CVE-2017-16723 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-16723 being exploited?

There is no known exploitation of CVE-2017-16723 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-16723 and fix it if it is affected.

What it is: CVE-2017-16723 is a medium-severity cross-site scripting vulnerability in PHOENIX CONTACT FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH, published on 11 Dec 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2017-16723 in the wild and no public exploit code.

Affected product: PHOENIX CONTACT FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH. 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-2017-16723/ (Markdown: https://insights.sbomify.com/CVE-2017-16723/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-16723
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-16723
- OSV: https://osv.dev/vulnerability/CVE-2017-16723

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-16723/
Summaries are generated and may contain mistakes; the official description above is the record.