# CVE-2023-35087: ASUS RT-AX56U V2 & RT-AC86U - Format String - 2

> Unauthenticated remote attackers can execute arbitrary code or disrupt service on ASUS routers via a format string vulnerability in the AiMesh system.

- **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:** 21 Jul 2023
- **Updated:** 24 Oct 2024
- **Also known as:** GHSA-4qh3-vw22-fpq6

## What is CVE-2023-35087?

CVE-2023-35087 is a critical vulnerability in ASUS RT-AC86U, published on 21 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

It is identified a format string vulnerability in ASUS RT-AX56U V2 & RT-AC86U. This vulnerability is caused by lacking validation for a specific value when calling cm_processChangedConfigMsg in ccm_processREQ_CHANGED_CONFIG function in AiMesh system. An unauthenticated remote attacker can exploit this vulnerability without privilege to perform remote arbitrary code execution, arbitrary system operation or disrupt service.
This issue affects RT-AX56U V2: 3.0.0.4.386_50460; RT-AC86U: 3.0.0.4_386_51529.

Weakness: CWE-134 (Use of Externally-Controlled Format String)

## Which versions are affected by CVE-2023-35087?

It affects 2 products.


Products: Asus Rt-Ac86u Firmware, Asus Rt-Ax56u V2 Firmware.

## How do I fix CVE-2023-35087?

No fix has been published for CVE-2023-35087 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-35087 being exploited?

There is no known exploitation of CVE-2023-35087 in the wild and no public exploit code.

## Other vulnerabilities in ASUS RT-AC86U

- [CVE-2023-38031](https://insights.sbomify.com/CVE-2023-38031/): ASUS RT-AC86U - Command injection vulnerability - 1 (high 8.8)
- [CVE-2023-38032](https://insights.sbomify.com/CVE-2023-38032/): ASUS RT-AC86U - Command injection vulnerability - 2 (high 8.8)
- [CVE-2023-38033](https://insights.sbomify.com/CVE-2023-38033/): ASUS RT-AC86U - Command injection vulnerability - 3 (high 8.8)
- [CVE-2023-39236](https://insights.sbomify.com/CVE-2023-39236/): ASUS RT-AC86U - Command injection vulnerability - 4 (high 8.8)
- [CVE-2023-39237](https://insights.sbomify.com/CVE-2023-39237/): ASUS RT-AC86U - Command injection vulnerability - 5 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-35087 and fix it if it is affected.

What it is: CVE-2023-35087 is a critical vulnerability in ASUS RT-AC86U, published on 21 Jul 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-2023-35087 in the wild and no public exploit code.

Affected product: ASUS RT-AC86U. 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-2023-35087/ (Markdown: https://insights.sbomify.com/CVE-2023-35087/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-35087
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-35087
- OSV: https://osv.dev/vulnerability/CVE-2023-35087

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-35087/
Summaries are generated and may contain mistakes; the official description above is the record.