# CVE-2023-39435: Zavio IP Camera Stack-Based Buffer Overflow

> Remote attackers can execute arbitrary code on Zavio IP cameras due to a stack-based buffer overflow in network request handling.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Nov 2023
- **Updated:** 16 Jan 2025
- **Also known as:** GHSA-75fp-j7f7-j7j8

## What is CVE-2023-39435?

CVE-2023-39435 is a high-severity memory corruption vulnerability in Zavio IP Camera B8220, published on 8 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Zavio CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220,
 CB6231, B8520, B8220, and CD321 IP Cameras 

with firmware version M2.1.6.05 are 
vulnerable to stack-based overflows. During the process of updating 
certain settings sent from incoming network requests, the product does 
not sufficiently check or validate allocated buffer size. This may lead 
to remote code execution.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2023-39435?

It affects 11 products.


Products: Zavio B8220 Firmware, Zavio B8520 Firmware, Zavio Cb3211 Firmware, Zavio Cb3212 Firmware, Zavio Cb5220 Firmware, Zavio Cb6231 Firmware, Zavio Cd321 Firmware, Zavio Cf7201 Firmware, Zavio Cf7300 Firmware, Zavio Cf7500 Firmware, Zavio Cf7501 Firmware.

## How do I fix CVE-2023-39435?

No fix has been published for CVE-2023-39435 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-39435 being exploited?

There is no known exploitation of CVE-2023-39435 in the wild and no public exploit code.

## Other vulnerabilities in Zavio IP Camera B8220

- [CVE-2023-3959](https://insights.sbomify.com/CVE-2023-3959/): Zavio IP Camera Stack-Based Buffer Overflow (critical 9.8)
- [CVE-2023-43755](https://insights.sbomify.com/CVE-2023-43755/): Zavio IP Camera Stack-Based Buffer Overflow (critical 9.8)
- [CVE-2023-45225](https://insights.sbomify.com/CVE-2023-45225/): Zavio IP Camera Stack-Based Buffer Overflow (critical 9.8)
- [CVE-2023-4249](https://insights.sbomify.com/CVE-2023-4249/): Zavio IP Camera Stack-Based Buffer Overflow (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-39435 and fix it if it is affected.

What it is: CVE-2023-39435 is a high-severity memory corruption vulnerability in Zavio IP Camera B8220, published on 8 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-39435 in the wild and no public exploit code.

Affected product: Zavio IP Camera B8220. 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-2023-39435/ (Markdown: https://insights.sbomify.com/CVE-2023-39435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-39435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-39435
- OSV: https://osv.dev/vulnerability/CVE-2023-39435

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-39435/
Summaries are generated and may contain mistakes; the official description above is the record.