# CVE-2025-27726: Path traversal in HGW-BL1500HM

> Attackers on the local network can read or modify files via path traversal in the USB file-sharing feature of the HGW-BL1500HM router.

- **Severity:** Low 2.1 (`CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Mar 2025
- **Updated:** 28 Mar 2025
- **Also known as:** GHSA-5xpq-j82h-xf63

## What is CVE-2025-27726?

CVE-2025-27726 is a low-severity path traversal vulnerability in KDDI CORPORATION HGW-BL1500HM, published on 28 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper limitation of a pathname to a restricted directory ('Path Traversal') issue exists in the file download process of the USB storage file-sharing function of HGW-BL1500HM Ver 002.002.003 and earlier. If this vulnerability is exploited, the product's files may be obtained and/or altered by a crafted HTTP request to specific functions of the product from a device connected to the LAN side.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-27726?


## How do I fix CVE-2025-27726?

No fix has been published for CVE-2025-27726 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-27726 being exploited?

There is no known exploitation of CVE-2025-27726 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27726 and fix it if it is affected.

What it is: CVE-2025-27726 is a low-severity path traversal vulnerability in KDDI CORPORATION HGW-BL1500HM, published on 28 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-27726 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-2025-27726/ (Markdown: https://insights.sbomify.com/CVE-2025-27726/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27726
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27726
- OSV: https://osv.dev/vulnerability/CVE-2025-27726

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27726/
Summaries are generated and may contain mistakes; the official description above is the record.