# CVE-2025-9356: Linksys RE6250/RE6300/RE6350/RE6500/RE7000/RE9000 inboundFilterAdd stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in Linksys range extenders via the inboundFilterAdd function, potentially leading to code execution or service disruption.

- **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:** 22 Aug 2025
- **Updated:** 26 Aug 2025
- **Also known as:** GHSA-vwr6-xxvv-9fw9

## What is CVE-2025-9356?

CVE-2025-9356 is a high-severity memory corruption vulnerability in Linksys Re6250 Firmware, published on 22 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was determined in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001. Affected by this issue is the function inboundFilterAdd of the file /goform/inboundFilterAdd. Executing manipulation of the argument ruleName can lead to stack-based buffer overflow. The attack may be performed from a remote location. The exploit has been publicly disclosed and may be utilized. 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-2025-9356?

It affects 6 products.


Products: Linksys Re6250 Firmware, Linksys Re6300 Firmware, Linksys Re6350 Firmware, Linksys Re6500 Firmware, Linksys Re7000 Firmware, Linksys Re9000 Firmware.

## How do I fix CVE-2025-9356?

No fix has been published for CVE-2025-9356 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9356 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9356 exists.

## Other vulnerabilities in Linksys Re6250 Firmware

- [CVE-2025-14133](https://insights.sbomify.com/CVE-2025-14133/): Memory corruption in RE6250 (high 8.7)
- [CVE-2025-14134](https://insights.sbomify.com/CVE-2025-14134/): Linksys RE6500/RE6250/RE6300/RE6350/RE7000/RE9000 mod_form.so stack-based overflow (high 8.7)
- [CVE-2025-14135](https://insights.sbomify.com/CVE-2025-14135/): Memory corruption in RE6250 (high 8.7)
- [CVE-2025-14136](https://insights.sbomify.com/CVE-2025-14136/): Linksys RE6500/RE6250/RE6300/RE6350/RE7000/RE9000 mod_form.so stack-based overflow (high 8.7)
- [CVE-2025-9481](https://insights.sbomify.com/CVE-2025-9481/): Linksys RE6250/RE6300/RE6350/RE6500/RE7000/RE9000 setIpv6 stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9356 and fix it if it is affected.

What it is: CVE-2025-9356 is a high-severity memory corruption vulnerability in Linksys Re6250 Firmware, published on 22 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-2025-9356 exists.

Affected product: Linksys Re6250 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-2025-9356/ (Markdown: https://insights.sbomify.com/CVE-2025-9356/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9356
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9356
- OSV: https://osv.dev/vulnerability/CVE-2025-9356

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9356/
Summaries are generated and may contain mistakes; the official description above is the record.