# CVE-2018-25237: Hirschmann HiSecOS Buffer Overflow via HTTPS Login

> Remote attackers can execute arbitrary code or crash Hirschmann HiSecOS firewalls by sending an overly long password when RADIUS authentication is enabled.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Apr 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-vrr4-2wxx-29jr

## What is CVE-2018-25237?

CVE-2018-25237 is a critical memory corruption vulnerability in Belden Hirschmann HiSecOS Classic Firewall (EAGLE, EAGLE One), published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Hirschmann HiSecOS devices versions prior to 05.3.03 contain a buffer overflow vulnerability in the HTTPS login interface when RADIUS authentication is enabled that allows remote attackers to crash the device or execute arbitrary code by submitting a password longer than 128 characters. Attackers can exploit improper bounds checking in password handling to overflow a fixed-size buffer and achieve denial of service or remote code execution.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2018-25237?


## How do I fix CVE-2018-25237?

No fix has been published for CVE-2018-25237 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-25237 being exploited?

There is no known exploitation of CVE-2018-25237 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-25237 and fix it if it is affected.

What it is: CVE-2018-25237 is a critical memory corruption vulnerability in Belden Hirschmann HiSecOS Classic Firewall (EAGLE, EAGLE One), published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-25237 in the wild and no public exploit code.

Affected product: Belden Hirschmann HiSecOS Classic Firewall (EAGLE, EAGLE One). 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-2018-25237/ (Markdown: https://insights.sbomify.com/CVE-2018-25237/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-25237
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-25237
- OSV: https://osv.dev/vulnerability/CVE-2018-25237

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-25237/
Summaries are generated and may contain mistakes; the official description above is the record.