# CVE-2025-27567: Cross-site scripting in HGW-BL1500HM

> An attacker can execute arbitrary scripts in the browser of users accessing the LAN-side configuration page of the HGW-BL1500HM home gateway.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Mar 2025
- **Updated:** 28 Mar 2025
- **Also known as:** GHSA-523h-xj4w-6jhm

## What is CVE-2025-27567?

CVE-2025-27567 is a medium-severity cross-site scripting vulnerability in KDDI CORPORATION HGW-BL1500HM, published on 28 Mar 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting vulnerability exists in the NickName registration screen of HGW-BL1500HM Ver 002.002.003 and earlier. If this vulnerability is exploited, an arbitrary script may be executed on the web browser of the user who is using the configuration page or functions accessible only from the LAN side of the product.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-27567?


## How do I fix CVE-2025-27567?

No fix has been published for CVE-2025-27567 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-27567 being exploited?

There is no known exploitation of CVE-2025-27567 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27567 and fix it if it is affected.

What it is: CVE-2025-27567 is a medium-severity cross-site scripting vulnerability in KDDI CORPORATION HGW-BL1500HM, published on 28 Mar 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-27567 in the wild and no public exploit code.

Affected product: KDDI CORPORATION HGW-BL1500HM. 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-2025-27567/ (Markdown: https://insights.sbomify.com/CVE-2025-27567/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27567
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27567
- OSV: https://osv.dev/vulnerability/CVE-2025-27567

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-27567/
Summaries are generated and may contain mistakes; the official description above is the record.