# CVE-2025-40539: SolarWinds Serv-U Type Confusion Remote Code Execution Vulnerability

> A type confusion flaw in Serv-U allows privileged attackers to execute arbitrary native code, requiring administrative access to exploit.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-jjx5-vcwr-cwfq

## What is CVE-2025-40539?

CVE-2025-40539 is a critical memory corruption vulnerability in Solarwinds Serv-U, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A type confusion vulnerability exists in Serv-U which when exploited, gives a malicious actor the ability to execute arbitrary native code as privileged account.

This issue requires administrative privileges to abuse. On Windows deployments, the risk is scored as a medium because services frequently run under less-privileged service accounts by default.

Weakness: CWE-704 (Incorrect Type Conversion or Cast)

## Which versions are affected by CVE-2025-40539?

It affects 1 product.


Products: Solarwinds Serv-U.

## How do I fix CVE-2025-40539?

No fix has been published for CVE-2025-40539 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40539 being exploited?

There is no known exploitation of CVE-2025-40539 in the wild and no public exploit code.

## Other vulnerabilities in Solarwinds Serv-U

- [CVE-2021-35211](https://insights.sbomify.com/CVE-2021-35211/): SolarWinds Serv-U Remote Code Execution (critical 9.0, exploited in the wild)
- [CVE-2024-28995](https://insights.sbomify.com/CVE-2024-28995/): SolarWinds Serv-U Path Traversal Vulnerability (high 8.6, exploited in the wild)
- [CVE-2026-28318](https://insights.sbomify.com/CVE-2026-28318/): SolarWinds Serv-U Uncontrolled Resource Consumption (high 7.5, exploited in the wild)
- [CVE-2021-35247](https://insights.sbomify.com/CVE-2021-35247/): SolarWinds Serv-U Improper Input Validation (medium 4.3, exploited in the wild)
- [CVE-2020-35481](https://insights.sbomify.com/CVE-2020-35481/): Code injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40539 and fix it if it is affected.

What it is: CVE-2025-40539 is a critical memory corruption vulnerability in Solarwinds Serv-U, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-40539 in the wild and no public exploit code.

Affected product: Solarwinds Serv-U. 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-2025-40539/ (Markdown: https://insights.sbomify.com/CVE-2025-40539/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40539
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40539
- OSV: https://osv.dev/vulnerability/CVE-2025-40539

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40539/
Summaries are generated and may contain mistakes; the official description above is the record.