# CVE-2024-20533: Cross-site scripting in Cisco IP Phones with Multiplatform Firmware

> Authenticated attackers can inject malicious scripts into Cisco IP Phone web UIs, enabling code execution or data theft if Web Access is enabled.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Nov 2024
- **Updated:** 6 Nov 2024
- **Also known as:** GHSA-rv5p-p324-cxv2

## What is CVE-2024-20533?

CVE-2024-20533 is a medium-severity cross-site scripting vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 6 Nov 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 6800, 7800, and 8800 Series, and Cisco Video Phone 8875 with Cisco Multiplatform Firmware could allow an authenticated, remote attacker to conduct stored cross-site scripting (XSS) attacks against users.

This vulnerability exists because the web UI of an affected device does not properly validate user-supplied input. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
Note: To exploit this vulnerability, Web Access must be enabled on the phone and the attacker must have Admin credentials on the device. Web Access is disabled by default.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2024-20533?

It affects 23 products.


Products: Cisco Desk Phone 9841 With Multiplatform Firmware, Cisco Desk Phone 9851 With Multiplatform Firmware, Cisco Desk Phone 9861 With Multiplatform Firmware, Cisco Desk Phone 9871 With Multiplatform Firmware, 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 8831 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 and 3 more.

## How do I fix CVE-2024-20533?

No fix has been published for CVE-2024-20533 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20533 being exploited?

There is no known exploitation of CVE-2024-20533 in the wild and no public exploit code.

## Other vulnerabilities in Cisco IP Phones with Multiplatform Firmware

- [CVE-2024-20534](https://insights.sbomify.com/CVE-2024-20534/): Cisco IP Phone 6800, 7800, 8800, and 9800 Series with Multiplatform Firmware Stored Cross-Site Scripting Vulnerability (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20533 and fix it if it is affected.

What it is: CVE-2024-20533 is a medium-severity cross-site scripting vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 6 Nov 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-20533 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-2024-20533/ (Markdown: https://insights.sbomify.com/CVE-2024-20533/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20533
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20533
- OSV: https://osv.dev/vulnerability/CVE-2024-20533

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20533/
Summaries are generated and may contain mistakes; the official description above is the record.