# CVE-2018-25259: Terminal Services Manager 3.1 Buffer Overflow SEH

> Local attackers can execute arbitrary code via a stack-based buffer overflow in the computer names field of Terminal Services Manager.

- **Severity:** High 8.6 (`CVSS:4.0/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Apr 2026
- **Updated:** 23 Apr 2026
- **Also known as:** GHSA-2m2r-hgfh-2mrp

## What is CVE-2018-25259?

CVE-2018-25259 is a high-severity memory corruption vulnerability in Lizardsystems Terminal Services Manager, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Terminal Services Manager 3.1 contains a stack-based buffer overflow vulnerability in the computer names field that allows local attackers to execute arbitrary code by triggering structured exception handling. Attackers can craft a malicious input file with shellcode and jump instructions that overwrite the SEH handler pointer to execute calc.exe or other payloads when imported through the add computers wizard.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2018-25259?

It affects 1 product.


Products: Lizardsystems Terminal Services Manager.

## How do I fix CVE-2018-25259?

No fix has been published for CVE-2018-25259 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-25259 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25259 exists.

## Other vulnerabilities in Lizardsystems Terminal Services Manager

- [CVE-2019-25545](https://insights.sbomify.com/CVE-2019-25545/): Terminal Services Manager 3.2.1 Local Buffer Overflow Denial of Service (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-25259 and fix it if it is affected.

What it is: CVE-2018-25259 is a high-severity memory corruption vulnerability in Lizardsystems Terminal Services Manager, published on 22 Apr 2026. 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-2018-25259 exists.

Affected product: Lizardsystems Terminal Services Manager. 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-2018-25259/ (Markdown: https://insights.sbomify.com/CVE-2018-25259/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-25259
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-25259
- OSV: https://osv.dev/vulnerability/CVE-2018-25259

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-25259/
Summaries are generated and may contain mistakes; the official description above is the record.