# CVE-2023-28768: Denial of service in XGS2220-30 firmware

> An unauthenticated LAN attacker can cause denial of service on Zyxel switches by sending crafted frames due to improper frame handling.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2023
- **Updated:** 1 Oct 2024
- **Also known as:** GHSA-7vjf-qw8c-2v29

## What is CVE-2023-28768?

CVE-2023-28768 is a medium-severity denial of service vulnerability in Zyxel XGS2220-30 firmware, published on 14 Aug 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper frame handling in the Zyxel XGS2220-30 firmware version V4.80(ABXN.1), XMG1930-30 firmware version V4.80(ACAR.1), and XS1930-10 firmware version V4.80(ABQE.1) could allow an unauthenticated LAN-based attacker to cause denial-of-service (DoS) conditions by sending crafted frames to an affected switch.

Weakness: CWE-755 (Improper Handling of Exceptional Conditions)

## Which versions are affected by CVE-2023-28768?

It affects 11 products.


Products: Zyxel Xgs2220-30 Firmware, Zyxel Xgs2220-30f Firmware, Zyxel Xgs2220-30hp Firmware, Zyxel Xgs2220-54 Firmware, Zyxel Xgs2220-54fp Firmware, Zyxel Xgs2220-54hp Firmware, Zyxel Xmg1930-30 Firmware, Zyxel Xmg1930-30hp Firmware, Zyxel Xs1930-10 Firmware, Zyxel Xs1930-12f Firmware, Zyxel Xs1930-12hp Firmware.

## How do I fix CVE-2023-28768?

No fix has been published for CVE-2023-28768 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-28768 being exploited?

There is no known exploitation of CVE-2023-28768 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-28768 and fix it if it is affected.

What it is: CVE-2023-28768 is a medium-severity denial of service vulnerability in Zyxel XGS2220-30 firmware, published on 14 Aug 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-28768 in the wild and no public exploit code.

Affected product: Zyxel XGS2220-30 firmware. 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-2023-28768/ (Markdown: https://insights.sbomify.com/CVE-2023-28768/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28768
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28768
- OSV: https://osv.dev/vulnerability/CVE-2023-28768

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-28768/
Summaries are generated and may contain mistakes; the official description above is the record.