# CVE-2023-20126: Cisco SPA112 2-Port Phone Adapters Remote Command Execution Vulnerability

> Unauthenticated attackers can execute arbitrary code with full privileges on Cisco SPA112 adapters by exploiting missing authentication in the firmware upgrade function.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 4 May 2023
- **Updated:** 28 Oct 2024
- **Also known as:** GHSA-x7fj-4595-2pp2

## What is CVE-2023-20126?

CVE-2023-20126 is a critical missing authorization vulnerability in Cisco Small Business IP Phones, published on 4 May 2023. 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 SPA112 2-Port Phone Adapters could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to a missing authentication process within the firmware upgrade function. An attacker could exploit this vulnerability by upgrading an affected device to a crafted version of firmware. A successful exploit could allow the attacker to execute arbitrary code on the affected device with full privileges. Cisco has not released firmware updates to address this vulnerability.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2023-20126?

It affects 1 product.


Products: Cisco Spa112 Firmware.

## How do I fix CVE-2023-20126?

No fix has been published for CVE-2023-20126 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-20126 being exploited?

There is no known exploitation of CVE-2023-20126 in the wild and no public exploit code.

Public exploit code:

- PoC for CVE-2023-20126 (github_poc): https://github.com/fullspectrumdev/RancidCrisco

## Other vulnerabilities in Cisco Small Business IP Phones

- [CVE-2019-15240](https://insights.sbomify.com/CVE-2019-15240/): Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities (high 8.0)
- [CVE-2019-15241](https://insights.sbomify.com/CVE-2019-15241/): Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities (high 8.0)
- [CVE-2019-15242](https://insights.sbomify.com/CVE-2019-15242/): Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities (high 8.0)
- [CVE-2019-15243](https://insights.sbomify.com/CVE-2019-15243/): Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities (high 8.0)
- [CVE-2019-15244](https://insights.sbomify.com/CVE-2019-15244/): Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-20126 and fix it if it is affected.

What it is: CVE-2023-20126 is a critical missing authorization vulnerability in Cisco Small Business IP Phones, published on 4 May 2023. 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-2023-20126 in the wild and no public exploit code.

Affected product: Cisco Small Business IP Phones. 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-2023-20126/ (Markdown: https://insights.sbomify.com/CVE-2023-20126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-20126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-20126
- OSV: https://osv.dev/vulnerability/CVE-2023-20126

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-20126/
Summaries are generated and may contain mistakes; the official description above is the record.