# CVE-2024-20376: Denial of service in Cisco IP Phones with Multiplatform Firmware

> Unauthenticated remote attackers can cause Cisco IP Phones to reload via crafted web requests, resulting in a denial of service.

- **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:** 1 May 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-fvx9-q8pv-wxv9

## What is CVE-2024-20376?

CVE-2024-20376 is a high-severity denial of service vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 1 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a DoS condition.  

 This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2024-20376?

It affects 18 products.


Products: Cisco Ip Phone 6821 With Multiplatform Firmware, Cisco Ip Phone 6841 With Multiplatform Firmware, Cisco Ip Phone 6851 With Multiplatform Firmware, Cisco Ip Phone 6861 With Multiplatform Firmware, Cisco Ip Phone 6871 With Multiplatform Firmware, Cisco Ip Phone 7811 With Multiplatform Firmware, Cisco Ip Phone 7821 With Multiplatform Firmware, Cisco Ip Phone 7832 With Multiplatform Firmware, Cisco Ip Phone 7841 With Multiplatform Firmware, Cisco Ip Phone 7861 With Multiplatform Firmware, Cisco Ip Phone 8811 With Multiplatform Firmware, Cisco Ip Phone 8832 With Multiplatform Firmware, Cisco Ip Phone 8841 With Multiplatform Firmware, Cisco Ip Phone 8845 With Multiplatform Firmware, Cisco Ip Phone 8851 With Multiplatform Firmware, Cisco Ip Phone 8861 With Multiplatform Firmware, Cisco Ip Phone 8865 With Multiplatform Firmware, Cisco Video Phone 8875 Firmware.

## How do I fix CVE-2024-20376?

No fix has been published for CVE-2024-20376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20376 being exploited?

There is no known exploitation of CVE-2024-20376 in the wild and no public exploit code.

## Other vulnerabilities in Cisco IP Phones with Multiplatform Firmware

- [CVE-2024-20378](https://insights.sbomify.com/CVE-2024-20378/): Missing authorization in Cisco IP Phones with Multiplatform Firmware (high 7.5)
- [CVE-2024-20357](https://insights.sbomify.com/CVE-2024-20357/): Memory corruption in Cisco IP Phones with Multiplatform Firmware (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20376 and fix it if it is affected.

What it is: CVE-2024-20376 is a high-severity denial of service vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 1 May 2024. 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-2024-20376 in the wild and no public exploit code.

Affected product: Cisco IP Phones with Multiplatform 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-2024-20376/ (Markdown: https://insights.sbomify.com/CVE-2024-20376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20376
- OSV: https://osv.dev/vulnerability/CVE-2024-20376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20376/
Summaries are generated and may contain mistakes; the official description above is the record.