# CVE-2022-43393: Denial of service in GS1920-24v2 firmware

> An unauthenticated attacker can cause a denial-of-service condition on Zyxel GS1920-24v2 switches by corrupting memory via improper HTTP request handling.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:** 11 Jan 2023
- **Updated:** 8 Apr 2025
- **Also known as:** GHSA-36hf-3x3x-vfch

## What is CVE-2022-43393?

CVE-2022-43393 is a high-severity denial of service vulnerability in Zyxel GS1920-24v2 firmware, published on 11 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An improper check for unusual or exceptional conditions in the HTTP request processing function of Zyxel GS1920-24v2 firmware prior to V4.70(ABMH.8)C0, which could allow an unauthenticated attacker to corrupt the contents of the memory and result in a denial-of-service (DoS) condition on a vulnerable device.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions)

## Which versions are affected by CVE-2022-43393?

It affects 45 products.


Products: Zyxel Gs1350-12hp Firmware, Zyxel Gs1350-18hp Firmware, Zyxel Gs1350-26hp Firmware, Zyxel Gs1350-6hp Firmware, Zyxel Gs1915-24e Firmware, Zyxel Gs1915-24ep Firmware, Zyxel Gs1915-8 Firmware, Zyxel Gs1915-8ep Firmware, Zyxel Gs1920-24hpv2 Firmware, Zyxel Gs1920-24v2 Firmware, Zyxel Gs1920-48hpv2 Firmware, Zyxel Gs1920-48v2 Firmware, Zyxel Gs2220-10 Firmware, Zyxel Gs2220-10hp Firmware, Zyxel Gs2220-28 Firmware, Zyxel Gs2220-28hp Firmware, Zyxel Gs2220-50 Firmware, Zyxel Gs2220-50hp Firmware, Zyxel Mgs3500-24s Firmware, Zyxel Mgs3520-28 Firmware and 25 more.

## How do I fix CVE-2022-43393?

No fix has been published for CVE-2022-43393 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43393 being exploited?

There is no known exploitation of CVE-2022-43393 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43393 and fix it if it is affected.

What it is: CVE-2022-43393 is a high-severity denial of service vulnerability in Zyxel GS1920-24v2 firmware, published on 11 Jan 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-2022-43393 in the wild and no public exploit code.

Affected product: Zyxel GS1920-24v2 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-2022-43393/ (Markdown: https://insights.sbomify.com/CVE-2022-43393/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43393
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43393
- OSV: https://osv.dev/vulnerability/CVE-2022-43393

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43393/
Summaries are generated and may contain mistakes; the official description above is the record.