# CVE-2023-27021: Memory corruption in n/a

> Attackers can cause denial of service or execute arbitrary code on Tenda AC10 routers via a stack overflow in the firewall configuration function.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 7 Apr 2023
- **Updated:** 12 Feb 2025
- **Also known as:** GHSA-f82r-2rhw-j45h

## What is CVE-2023-27021?

CVE-2023-27021 is a critical memory corruption vulnerability in Tenda Ac10 Firmware, published on 7 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tenda AC10 US_AC10V4.0si_V16.03.10.13_cn was discovered to contain a stack overflow via the formSetFirewallCfg function. This vulnerability allows attackers to cause a Denial of Service (DoS) or execute arbitrary code via a crafted payload.

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

## Which versions are affected by CVE-2023-27021?

It affects 1 product.


Products: Tenda Ac10 Firmware.

## How do I fix CVE-2023-27021?

No fix has been published for CVE-2023-27021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-27021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27021 exists.

## Other vulnerabilities in Tenda Ac10 Firmware

- [CVE-2018-14558](https://insights.sbomify.com/CVE-2018-14558/): Tenda AC7, AC9, and AC10 Routers Command Injection (critical 9.8, exploited in the wild)
- [CVE-2025-67073](https://insights.sbomify.com/CVE-2025-67073/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-45779](https://insights.sbomify.com/CVE-2025-45779/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25456](https://insights.sbomify.com/CVE-2025-25456/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25674](https://insights.sbomify.com/CVE-2025-25674/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-27021 and fix it if it is affected.

What it is: CVE-2023-27021 is a critical memory corruption vulnerability in Tenda Ac10 Firmware, published on 7 Apr 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-2023-27021 exists.

Affected product: Tenda Ac10 Firmware. 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-2023-27021/ (Markdown: https://insights.sbomify.com/CVE-2023-27021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-27021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-27021
- OSV: https://osv.dev/vulnerability/CVE-2023-27021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-27021/
Summaries are generated and may contain mistakes; the official description above is the record.