# CVE-2025-5156: H3C GR-5400AX aspForm EditWlanMacList buffer overflow

> Remote attackers can trigger a buffer overflow in the H3C GR-5400AX router's WLAN MAC list editor, 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`)
- **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:** 25 May 2025
- **Updated:** 28 May 2025
- **Also known as:** GHSA-p84j-ggc3-5x2h

## What is CVE-2025-5156?

CVE-2025-5156 is a high-severity memory corruption vulnerability in H3C GR-5400AX, published on 25 May 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in H3C GR-5400AX up to 100R008 and classified as critical. Affected by this issue is the function EditWlanMacList of the file /routing/goform/aspForm. The manipulation of the argument param leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-5156?

It affects 1 product.


Products: H3c Gr-5400ax Firmware.

## How do I fix CVE-2025-5156?

No fix has been published for CVE-2025-5156 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-5156 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5156 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-5156 and fix it if it is affected.

What it is: CVE-2025-5156 is a high-severity memory corruption vulnerability in H3C GR-5400AX, published on 25 May 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-2025-5156 exists.

Affected product: H3C GR-5400AX. 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-2025-5156/ (Markdown: https://insights.sbomify.com/CVE-2025-5156/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-5156
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-5156
- OSV: https://osv.dev/vulnerability/CVE-2025-5156

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-5156/
Summaries are generated and may contain mistakes; the official description above is the record.