# CVE-2025-2859: Improper Authentication vulnerability in saTECH BCU

> An attacker can steal user sessions via traffic capture to modify device settings, affecting saTECH BCU users.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Mar 2025
- **Updated:** 4 Apr 2025
- **Also known as:** GHSA-x6xj-c9qw-4fjp

## What is CVE-2025-2859?

CVE-2025-2859 is a medium-severity authentication bypass vulnerability in Arteche saTECH BCU, published on 28 Mar 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An attacker with network access, could capture traffic and obtain user cookies, allowing the attacker to steal the active user session and make changes to the device via web, depending on the privileges obtained by the user.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-2859?

It affects 1 product.


Products: Arteche Satech Bcu Firmware.

## How do I fix CVE-2025-2859?

No fix has been published for CVE-2025-2859 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-2859 being exploited?

There is no known exploitation of CVE-2025-2859 in the wild and no public exploit code.

## Other vulnerabilities in Arteche saTECH BCU

- [CVE-2025-2858](https://insights.sbomify.com/CVE-2025-2858/): Privilege escalation vulnerability in saTECH BCU (high 8.5)
- [CVE-2025-2860](https://insights.sbomify.com/CVE-2025-2860/): Exposure of Sensitive Information vulnerability in saTECH BCU (medium 6.9)
- [CVE-2025-2861](https://insights.sbomify.com/CVE-2025-2861/): Cleartext Transmission of Sensitive Information vulnerability in saTECH BCU (medium 6.9)
- [CVE-2025-2862](https://insights.sbomify.com/CVE-2025-2862/): Weak Encoding for Password vulnerability in saTECH BCU (medium 6.9)
- [CVE-2025-2863](https://insights.sbomify.com/CVE-2025-2863/): Cross-site request forgery (CSRF) vulnerability in saTECH BCU (medium 5.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-2859 and fix it if it is affected.

What it is: CVE-2025-2859 is a medium-severity authentication bypass vulnerability in Arteche saTECH BCU, published on 28 Mar 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-2859 in the wild and no public exploit code.

Affected product: Arteche saTECH BCU. 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-2025-2859/ (Markdown: https://insights.sbomify.com/CVE-2025-2859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-2859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-2859
- OSV: https://osv.dev/vulnerability/CVE-2025-2859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-2859/
Summaries are generated and may contain mistakes; the official description above is the record.