# CVE-2025-7564: LB-LINK BL-AC3600 shadow hard-coded credentials

> Hard-coded credentials in the shadow file allow local attackers to gain root privileges on LB-LINK BL-AC3600 routers.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2025
- **Updated:** 14 Jul 2025
- **Also known as:** GHSA-hc7g-5qrx-9jvj

## What is CVE-2025-7564?

CVE-2025-7564 is a high-severity vulnerability in LB-LINK BL-AC3600, published on 14 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability, which was classified as critical, has been found in LB-LINK BL-AC3600 1.0.22. Affected by this issue is some unknown functionality of the file /etc/shadow. The manipulation with the input root:blinkadmin leads to hard-coded credentials. Local access is required to approach this attack. 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-798 (Use of Hard-coded Credentials), CWE-259 (Use of Hard-coded Password)

## Which versions are affected by CVE-2025-7564?

It affects 1 product.


Products: Lb-Link Bl-Ac3600 Firmware.

## How do I fix CVE-2025-7564?

No fix has been published for CVE-2025-7564 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-7564 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7564 exists.

## Other vulnerabilities in LB-LINK BL-AC3600

- [CVE-2025-7565](https://insights.sbomify.com/CVE-2025-7565/): LB-LINK BL-AC3600 Web Management Interface lighttpd.cgi geteasycfg information disclosure (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7564 and fix it if it is affected.

What it is: CVE-2025-7564 is a high-severity vulnerability in LB-LINK BL-AC3600, published on 14 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7564 exists.

Affected product: LB-LINK BL-AC3600. 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-2025-7564/ (Markdown: https://insights.sbomify.com/CVE-2025-7564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7564
- OSV: https://osv.dev/vulnerability/CVE-2025-7564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7564/
Summaries are generated and may contain mistakes; the official description above is the record.