# CVE-2016-1421: Memory corruption in Cisco IP Phones

> Unauthenticated remote attackers can execute code with root privileges or cause a denial of service on Cisco IP Phones via crafted HTTP requests.

- **Severity:** High 7.5 (`CVSS:3.0/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:** 10 Jun 2016
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-25qv-8m5r-8645

## What is CVE-2016-1421?

CVE-2016-1421 is a high-severity memory corruption vulnerability in Cisco IP Phones, published on 10 Jun 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the web application for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software fails to check the bounds of input data. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web server of a targeted device. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a DoS condition.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2016-1421?

It affects 1 product.


Products: Cisco Ip Phone 8800 Series Firmware.

## How do I fix CVE-2016-1421?

No fix has been published for CVE-2016-1421 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-1421 being exploited?

There is no known exploitation of CVE-2016-1421 in the wild and no public exploit code.

## Other vulnerabilities in Cisco IP Phones

- [CVE-2016-1403](https://insights.sbomify.com/CVE-2016-1403/): Command injection in n/a (high 7.8)
- [CVE-2016-1479](https://insights.sbomify.com/CVE-2016-1479/): Memory corruption in n/a (high 7.5)
- [CVE-2016-1435](https://insights.sbomify.com/CVE-2016-1435/): Missing authorization in n/a (high 7.0)
- [CVE-2017-12305](https://insights.sbomify.com/CVE-2017-12305/): Command injection in Cisco IP Phone 8800 Series (medium 6.7)
- [CVE-2018-0461](https://insights.sbomify.com/CVE-2018-0461/): Cisco IP Phone 8800 Series Arbitrary Script Injection Vulnerability (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-1421 and fix it if it is affected.

What it is: CVE-2016-1421 is a high-severity memory corruption vulnerability in Cisco IP Phones, published on 10 Jun 2016. 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-2016-1421 in the wild and no public exploit code.

Affected product: Cisco 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-2016-1421/ (Markdown: https://insights.sbomify.com/CVE-2016-1421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1421
- OSV: https://osv.dev/vulnerability/CVE-2016-1421

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1421/
Summaries are generated and may contain mistakes; the official description above is the record.