# CVE-2026-3700: UTT HiPER 810G formConfigDnsFilterGlobal strcpy buffer overflow

> Remote attackers can exploit a buffer overflow in the DNS filter configuration to execute arbitrary code or crash the UTT HiPER 810G router.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **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 Mar 2026
- **Updated:** 10 Mar 2026
- **Also known as:** GHSA-gf2c-cq33-9pf7

## What is CVE-2026-3700?

CVE-2026-3700 is a high-severity memory corruption vulnerability in UTT HiPER 810G, published on 8 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A weakness has been identified in UTT HiPER 810G up to 1.7.7-171114. Affected is the function strcpy of the file /goform/formConfigDnsFilterGlobal. This manipulation causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-3700?

It affects 1 product.


Products: Utt 810g Firmware.

## How do I fix CVE-2026-3700?

No fix has been published for CVE-2026-3700 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3700 being exploited?

There is no known exploitation of CVE-2026-3700 in the wild and no public exploit code.

## Other vulnerabilities in UTT HiPER 810G

- [CVE-2026-3814](https://insights.sbomify.com/CVE-2026-3814/): UTT HiPER 810G getOneApConfTempEntry strcpy buffer overflow (high 8.7)
- [CVE-2026-3815](https://insights.sbomify.com/CVE-2026-3815/): UTT HiPER 810G formApMail strcpy buffer overflow (high 8.7)
- [CVE-2026-3698](https://insights.sbomify.com/CVE-2026-3698/): UTT HiPER 810G NTP strcpy buffer overflow (high 8.7)
- [CVE-2026-3699](https://insights.sbomify.com/CVE-2026-3699/): UTT HiPER 810G formRemoteControl strcpy buffer overflow (high 8.7)
- [CVE-2026-2981](https://insights.sbomify.com/CVE-2026-2981/): UTT HiPER 810G formTaskEdit_ap strcpy buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3700 and fix it if it is affected.

What it is: CVE-2026-3700 is a high-severity memory corruption vulnerability in UTT HiPER 810G, published on 8 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3700 in the wild and no public exploit code.

Affected product: UTT HiPER 810G. 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-2026-3700/ (Markdown: https://insights.sbomify.com/CVE-2026-3700/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3700
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3700
- OSV: https://osv.dev/vulnerability/CVE-2026-3700

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3700/
Summaries are generated and may contain mistakes; the official description above is the record.