# CVE-2025-63835: Memory corruption in n/a

> Remote attackers can cause denial of service or potential code execution on Tenda AC18 routers via a stack-based buffer overflow in the guestSsid parameter.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Nov 2025
- **Updated:** 18 Nov 2025
- **Also known as:** GHSA-2mgg-5ppq-j685

## What is CVE-2025-63835?

CVE-2025-63835 is a medium-severity memory corruption vulnerability in Tenda Ac18 Firmware, published on 10 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A stack-based buffer overflow vulnerability was discovered in Tenda AC18 v15.03.05.05_multi. The vulnerability exists in the guestSsid parameter of the /goform/WifiGuestSet interface. Remote attackers can exploit this vulnerability by sending oversized data to the guestSsid parameter, leading to denial of service (device crash) or potential remote code execution.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2025-63835?

It affects 1 product.


Products: Tenda Ac18 Firmware.

## How do I fix CVE-2025-63835?

No fix has been published for CVE-2025-63835 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-63835 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63835 exists.

## Other vulnerabilities in Tenda Ac18 Firmware

- [CVE-2024-57575](https://insights.sbomify.com/CVE-2024-57575/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-57579](https://insights.sbomify.com/CVE-2024-57579/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-57580](https://insights.sbomify.com/CVE-2024-57580/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-57581](https://insights.sbomify.com/CVE-2024-57581/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-57582](https://insights.sbomify.com/CVE-2024-57582/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-63835 and fix it if it is affected.

What it is: CVE-2025-63835 is a medium-severity memory corruption vulnerability in Tenda Ac18 Firmware, published on 10 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63835 exists.

Affected product: Tenda Ac18 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-2025-63835/ (Markdown: https://insights.sbomify.com/CVE-2025-63835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-63835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-63835
- OSV: https://osv.dev/vulnerability/CVE-2025-63835

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-63835/
Summaries are generated and may contain mistakes; the official description above is the record.