# CVE-2023-40710: Denial of service in SNAP PAC S1

> An attacker can cause a device restart loop via HTTP requests if the web server is enabled but unconfigured, affecting OPTO 22 SNAP PAC S1 controllers.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Aug 2023
- **Updated:** 30 Sep 2024
- **Also known as:** GHSA-4cjc-ff35-f4f5

## What is CVE-2023-40710?

CVE-2023-40710 is a medium-severity denial of service vulnerability in OPTO 22 SNAP PAC S1, published on 24 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An adversary could cause a continuous restart loop to the entire device by sending a large quantity of HTTP GET requests if the controller has the built-in web server enabled but does not have the built-in web server completely set up and configured for the SNAP PAC S1 Firmware version R10.3b

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2023-40710?

It affects 1 product.


Products: Opto22 Snap Pac S1 Firmware.

## How do I fix CVE-2023-40710?

No fix has been published for CVE-2023-40710 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-40710 being exploited?

There is no known exploitation of CVE-2023-40710 in the wild and no public exploit code.

## Other vulnerabilities in OPTO 22 SNAP PAC S1

- [CVE-2023-40706](https://insights.sbomify.com/CVE-2023-40706/): Improper Restriction of Excessive Authentication Attempts in OPTO 22 SNAP PAC S1 Built-in Web Server (high 8.6)
- [CVE-2023-40707](https://insights.sbomify.com/CVE-2023-40707/): Weak password requirements in OPTO 22 SNAP PAC S1 Built-in Web Server (high 8.6)
- [CVE-2023-40709](https://insights.sbomify.com/CVE-2023-40709/): Uncontrolled Resource Consumption in OPTO 22 SNAP PAC S1 Built-In Web Server (medium 6.8)
- [CVE-2023-40708](https://insights.sbomify.com/CVE-2023-40708/): Improper Access Control in OPTO 22 SNAP PAC S1 (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-40710 and fix it if it is affected.

What it is: CVE-2023-40710 is a medium-severity denial of service vulnerability in OPTO 22 SNAP PAC S1, published on 24 Aug 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-2023-40710 in the wild and no public exploit code.

Affected product: OPTO 22 SNAP PAC S1. 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-2023-40710/ (Markdown: https://insights.sbomify.com/CVE-2023-40710/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-40710
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-40710
- OSV: https://osv.dev/vulnerability/CVE-2023-40710

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-40710/
Summaries are generated and may contain mistakes; the official description above is the record.