# CVE-2023-39827: Memory corruption in n/a

> A stack overflow in the Tenda A18 router allows attackers to execute arbitrary code or cause a denial of service via the rule_info parameter.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 14 Aug 2023
- **Updated:** 9 Oct 2024
- **Also known as:** GHSA-22x3-74c8-hwpv

## What is CVE-2023-39827?

CVE-2023-39827 is a high-severity memory corruption vulnerability in n/a, published on 14 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tenda A18 V15.13.07.09 was discovered to contain a stack overflow via the rule_info parameter in the formAddMacfilterRule function.

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

## Which versions are affected by CVE-2023-39827?

It affects 1 product.


Products: Tenda A18 Firmware.

## How do I fix CVE-2023-39827?

No fix has been published for CVE-2023-39827 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-39827 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-39827 exists.

## Other vulnerabilities in n/a

- [CVE-2023-50585](https://insights.sbomify.com/CVE-2023-50585/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-32305](https://insights.sbomify.com/CVE-2024-32305/): Memory corruption in n/a (high 8.8)
- [CVE-2026-2876](https://insights.sbomify.com/CVE-2026-2876/): Tenda A18 setBlackRule parse_macfilter_rule stack-based overflow (high 8.7)
- [CVE-2026-2877](https://insights.sbomify.com/CVE-2026-2877/): Tenda A18 Httpd Service WifiExtraSet strcpy stack-based overflow (high 8.7)
- [CVE-2023-39828](https://insights.sbomify.com/CVE-2023-39828/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-39827 and fix it if it is affected.

What it is: CVE-2023-39827 is a high-severity memory corruption vulnerability in n/a, published on 14 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-39827 exists.

Affected product: n/a. 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-2023-39827/ (Markdown: https://insights.sbomify.com/CVE-2023-39827/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-39827
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-39827
- OSV: https://osv.dev/vulnerability/CVE-2023-39827

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-39827/
Summaries are generated and may contain mistakes; the official description above is the record.