# CVE-2023-38556: Denial of service in SEIKO EPSON printer Web Config

> A remote attacker can turn off the printer due to improper input validation in the Web Config interface.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Aug 2023
- **Updated:** 21 Oct 2024
- **Also known as:** GHSA-whxf-cw32-jmhm

## What is CVE-2023-38556?

CVE-2023-38556 is a high-severity denial of service vulnerability in SEIKO EPSON printer Web Config, published on 2 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper input validation vulnerability in SEIKO EPSON printer Web Config allows a remote attacker to turned off the printer.
[Note] Web Config is the software that allows users to check the status and change the settings of SEIKO EPSON printers via a web browser. Web Config is pre-installed in some printers provided by SEIKO EPSON CORPORATION. For the details of the affected product names/model numbers, refer to the information provided by the vendor.

## Which versions are affected by CVE-2023-38556?

It affects 12 products.


Products: Epson Ep-801a Firmware, Epson Ep-802a Firmware, Epson Ep-901a Firmware, Epson Ep-901f Firmware, Epson Ep-902a Firmware, Epson Pa-Tcu1 Firmware, Epson Pm-T960 Firmware, Epson Pm-T990 Firmware, Epson Px-201 Firmware, Epson Px-502a Firmware, Epson Px-601f Firmware, Epson Px-602f Firmware.

## How do I fix CVE-2023-38556?

No fix has been published for CVE-2023-38556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-38556 being exploited?

There is no known exploitation of CVE-2023-38556 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-38556 and fix it if it is affected.

What it is: CVE-2023-38556 is a high-severity denial of service vulnerability in SEIKO EPSON printer Web Config, published on 2 Aug 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-2023-38556 in the wild and no public exploit code.

Affected product: SEIKO EPSON printer Web Config. 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-2023-38556/ (Markdown: https://insights.sbomify.com/CVE-2023-38556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-38556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-38556
- OSV: https://osv.dev/vulnerability/CVE-2023-38556

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-38556/
Summaries are generated and may contain mistakes; the official description above is the record.