# CVE-2020-16139: Denial of service in n/a

> Attackers can remotely restart Cisco Unified IP Conference Stations via crafted packets, though the vulnerability is unproven and the product is end-of-life.

- **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:** 12 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-8c2f-jx3v-cm8h

## What is CVE-2020-16139?

CVE-2020-16139 is a high-severity denial of service vulnerability in n/a, published on 12 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A denial-of-service in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attackers restart the device remotely through sending specially crafted packets. Note: We cannot prove this vulnerability exists. Out of an abundance of caution, this CVE is being assigned to better serve our customers and ensure all who are still running this product understand that the product is end of life and should be removed or upgraded. For more information on this, and how to upgrade, refer to the CVE’s reference information

## Which versions are affected by CVE-2020-16139?

It affects 1 product.


Products: Cisco Unified Ip Conference Station 7937g Firmware.

## How do I fix CVE-2020-16139?

No fix has been published for CVE-2020-16139 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-16139 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-16139 exists.

Public exploit code:

- Cisco 7937G Denial-of-Service Reboot Attack (metasploit)
- Cisco Unified IP Conference Station 7937G - Denial-of-Service (nuclei): http/cves/2020/CVE-2020-16139.yaml

## Other vulnerabilities in n/a

- [CVE-2020-16137](https://insights.sbomify.com/CVE-2020-16137/): Privilege escalation in n/a (critical 9.8)
- [CVE-2020-16138](https://insights.sbomify.com/CVE-2020-16138/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-16139 and fix it if it is affected.

What it is: CVE-2020-16139 is a high-severity denial of service vulnerability in n/a, published on 12 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-16139 exists.

Affected product: n/a. 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-2020-16139/ (Markdown: https://insights.sbomify.com/CVE-2020-16139/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-16139
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-16139
- OSV: https://osv.dev/vulnerability/CVE-2020-16139

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-16139/
Summaries are generated and may contain mistakes; the official description above is the record.