# CVE-2023-0782: Tenda AC23 httpd formGetSysToolDDNS out-of-bounds write

> Remote attackers can trigger an out-of-bounds write in the Tenda AC23 router's httpd service, potentially leading to arbitrary code execution.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Feb 2023
- **Updated:** 24 Mar 2025
- **Also known as:** GHSA-mjgf-fjmw-jf84

## What is CVE-2023-0782?

CVE-2023-0782 is a high-severity memory corruption vulnerability in Tenda AC23, published on 11 Feb 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability was found in Tenda AC23 16.03.07.45 and classified as critical. Affected by this issue is the function formSetSysToolDDNS/formGetSysToolDDNS of the file /bin/httpd. The manipulation leads to out-of-bounds write. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-220640.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2023-0782?

It affects 1 product.


Products: Tenda Ac23 Firmware.

## How do I fix CVE-2023-0782?

No fix has been published for CVE-2023-0782 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-0782 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0782 exists.

## Other vulnerabilities in Tenda AC23

- [CVE-2023-40799](https://insights.sbomify.com/CVE-2023-40799/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-43101](https://insights.sbomify.com/CVE-2022-43101/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-43102](https://insights.sbomify.com/CVE-2022-43102/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-43103](https://insights.sbomify.com/CVE-2022-43103/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-43104](https://insights.sbomify.com/CVE-2022-43104/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0782 and fix it if it is affected.

What it is: CVE-2023-0782 is a high-severity memory corruption vulnerability in Tenda AC23, published on 11 Feb 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0782 exists.

Affected product: Tenda AC23. 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-2023-0782/ (Markdown: https://insights.sbomify.com/CVE-2023-0782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0782
- OSV: https://osv.dev/vulnerability/CVE-2023-0782

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0782/
Summaries are generated and may contain mistakes; the official description above is the record.