# CVE-2021-25909: ZIV AUTOMATION 4CCT Denial of Service vulnerability

> Unauthenticated remote attackers can cause a denial of service on ZIV Automation 4CCT devices by sending specific packets to port 7919.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** 29 Jan 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-72wr-xhp6-g67f

## What is CVE-2021-25909?

CVE-2021-25909 is a high-severity denial of service vulnerability in ZIV AUTOMATION 4CCT-EA6-334126BF, published on 29 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ZIV Automation 4CCT-EA6-334126BF firmware version 3.23.80.27.36371, allows an unauthenticated, remote attacker to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending specific packets to the port 7919.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2021-25909?

It affects 1 product.


Products: Zivautomation 4cct-Ea6-334126bf Firmware.

## How do I fix CVE-2021-25909?

No fix has been published for CVE-2021-25909 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25909 being exploited?

There is no known exploitation of CVE-2021-25909 in the wild and no public exploit code.

## Other vulnerabilities in ZIV AUTOMATION 4CCT-EA6-334126BF

- [CVE-2021-25910](https://insights.sbomify.com/CVE-2021-25910/): ZIV AUTOMATION 4CCT vulnerable to improper authentication (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25909 and fix it if it is affected.

What it is: CVE-2021-25909 is a high-severity denial of service vulnerability in ZIV AUTOMATION 4CCT-EA6-334126BF, published on 29 Jan 2021. 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-2021-25909 in the wild and no public exploit code.

Affected product: ZIV AUTOMATION 4CCT-EA6-334126BF. 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-2021-25909/ (Markdown: https://insights.sbomify.com/CVE-2021-25909/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25909
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25909
- OSV: https://osv.dev/vulnerability/CVE-2021-25909

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25909/
Summaries are generated and may contain mistakes; the official description above is the record.