# CVE-2023-20047: Denial of service in Cisco Webex Room Phone

> An unauthenticated adjacent attacker can cause a denial of service on Cisco Webex Room Phones by exhausting memory via crafted LLDP traffic.

- **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:** 19 Jan 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-5f68-jm8v-355j

## What is CVE-2023-20047?

CVE-2023-20047 is a medium-severity denial of service vulnerability in Cisco Webex Room Phone, published on 19 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco Webex Room Phone and Cisco Webex Share devices could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

 This vulnerability is due to insufficient resource allocation. An attacker could exploit this vulnerability by sending crafted LLDP traffic to an affected device. A successful exploit could allow the attacker to exhaust the memory resources of the affected device, resulting in a crash of the LLDP process. If the affected device is configured to support LLDP only, this could cause an interruption to inbound and outbound calling. By default, these devices are configured to support both Cisco Discovery Protocol and LLDP. To recover operational state, the affected device needs a manual restart.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2023-20047?

It affects 3 products.


Products: Cisco Sip Ip Phone Software, Cisco Webex Room Phone Firmware, Cisco Webex Share Firmware.

## How do I fix CVE-2023-20047?

No fix has been published for CVE-2023-20047 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-20047 being exploited?

There is no known exploitation of CVE-2023-20047 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-20047 and fix it if it is affected.

What it is: CVE-2023-20047 is a medium-severity denial of service vulnerability in Cisco Webex Room Phone, published on 19 Jan 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-2023-20047 in the wild and no public exploit code.

Affected product: Cisco Webex Room Phone. 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-2023-20047/ (Markdown: https://insights.sbomify.com/CVE-2023-20047/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-20047
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-20047
- OSV: https://osv.dev/vulnerability/CVE-2023-20047

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-20047/
Summaries are generated and may contain mistakes; the official description above is the record.