# CVE-2025-9527: Linksys E1700 QoSSetup stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the QoSSetup function of Linksys E1700 routers, potentially leading to arbitrary code execution.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Aug 2025
- **Updated:** 27 Aug 2025
- **Also known as:** GHSA-wmmv-mw2h-x89h

## What is CVE-2025-9527?

CVE-2025-9527 is a high-severity memory corruption vulnerability in Linksys E1700, published on 27 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Linksys E1700 1.0.0.4.003. This affects the function QoSSetup of the file /goform/QoSSetup. Performing manipulation of the argument ack_policy results in stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-9527?

It affects 1 product.


Products: Linksys E1700 Firmware.

## How do I fix CVE-2025-9527?

No fix has been published for CVE-2025-9527 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9527 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9527 exists.

## Other vulnerabilities in Linksys E1700

- [CVE-2025-9525](https://insights.sbomify.com/CVE-2025-9525/): Linksys E1700 setWan stack-based overflow (high 8.7)
- [CVE-2025-9526](https://insights.sbomify.com/CVE-2025-9526/): Linksys E1700 setSysAdm stack-based overflow (high 8.7)
- [CVE-2024-22544](https://insights.sbomify.com/CVE-2024-22544/): Command injection in n/a (high 8.0)
- [CVE-2024-22543](https://insights.sbomify.com/CVE-2024-22543/): Privilege escalation in n/a (medium 6.1)
- [CVE-2025-9528](https://insights.sbomify.com/CVE-2025-9528/): Linksys E1700 systemCommand os command injection (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9527 and fix it if it is affected.

What it is: CVE-2025-9527 is a high-severity memory corruption vulnerability in Linksys E1700, published on 27 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9527 exists.

Affected product: Linksys E1700. 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-2025-9527/ (Markdown: https://insights.sbomify.com/CVE-2025-9527/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9527
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9527
- OSV: https://osv.dev/vulnerability/CVE-2025-9527

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9527/
Summaries are generated and may contain mistakes; the official description above is the record.