# CVE-2023-35698: Information disclosure in ICR890-4

> Remote attackers can enumerate valid FTP usernames on SICK ICR890-4 devices by analyzing response discrepancies during failed login attempts.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 10 Jul 2023
- **Updated:** 1 Jun 2026
- **Also known as:** GHSA-4fq5-58j6-9qph

## What is CVE-2023-35698?

CVE-2023-35698 is a medium-severity vulnerability in SICK AG ICR890-4, published on 10 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Observable Response Discrepancy in the SICK ICR890-4 could allow a remote attacker to identify valid usernames for the FTP server from the response given during a failed login
attempt.

Weakness: CWE-203 (Observable Discrepancy), CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2023-35698?

It affects 1 product.


Products: Sick Icr890-4 Firmware.

## How do I fix CVE-2023-35698?

No fix has been published for CVE-2023-35698 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-35698 being exploited?

There is no known exploitation of CVE-2023-35698 in the wild and no public exploit code.

## Other vulnerabilities in SICK AG ICR890-4

- [CVE-2023-3270](https://insights.sbomify.com/CVE-2023-3270/): Information disclosure in ICR890-4 (high 8.6)
- [CVE-2023-3271](https://insights.sbomify.com/CVE-2023-3271/): Missing authorization in ICR890-4 (high 8.2)
- [CVE-2023-3272](https://insights.sbomify.com/CVE-2023-3272/): Information disclosure in ICR890-4 (high 7.5)
- [CVE-2023-3273](https://insights.sbomify.com/CVE-2023-3273/): Missing authorization in ICR890-4 (high 7.5)
- [CVE-2023-35696](https://insights.sbomify.com/CVE-2023-35696/): Information disclosure in ICR890-4 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-35698 and fix it if it is affected.

What it is: CVE-2023-35698 is a medium-severity vulnerability in SICK AG ICR890-4, published on 10 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-35698 in the wild and no public exploit code.

Affected product: SICK AG ICR890-4. 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-2023-35698/ (Markdown: https://insights.sbomify.com/CVE-2023-35698/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-35698
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-35698
- OSV: https://osv.dev/vulnerability/CVE-2023-35698

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-35698/
Summaries are generated and may contain mistakes; the official description above is the record.