# CVE-2025-20389: Improper Input Validation in "label" column field in Splunk Secure Gateway App

> A low-privileged user can cause a client-side denial of service in Splunk Secure Gateway by crafting a malicious payload in the label field.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Dec 2025
- **Updated:** 3 Dec 2025
- **Also known as:** GHSA-49x5-pp3j-h44f

## What is CVE-2025-20389?

CVE-2025-20389 is a medium-severity denial of service vulnerability in Splunk Splunk, published on 3 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Splunk Enterprise versions below 10.0.2, 9.4.6, 9.3.8, and 9.2.10, and versions below 3.9.10, 3.8.58 and 3.7.28 of the Splunk Secure Gateway app on Splunk Cloud Platform, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload through the `label` column field after adding a new device in the Splunk Secure Gateway app. This could potentially lead to a client-side denial of service (DoS).

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-20389?

It affects 3 products.


Products: Splunk Splunk, Splunk Splunk Cloud Platform, Splunk Splunk Secure Gateway.

## How do I fix CVE-2025-20389?

No fix has been published for CVE-2025-20389 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20389 being exploited?

There is no known exploitation of CVE-2025-20389 in the wild and no public exploit code.

## Other vulnerabilities in Splunk Splunk

- [CVE-2026-20253](https://insights.sbomify.com/CVE-2026-20253/): Splunk Enterprise Missing Authentication for Critical Function (critical 9.8, exploited in the wild)
- [CVE-2026-76268](https://insights.sbomify.com/CVE-2026-76268/): Missing Authentication for Critical Function in the Patroni REST API in Splunk Enterprise (critical 9.8)
- [CVE-2026-76284](https://insights.sbomify.com/CVE-2026-76284/): Improper Neutralization in Splunk Enterprise (critical 9.8)
- [CVE-2026-76285](https://insights.sbomify.com/CVE-2026-76285/): Improper Adherence to Coding Standards in Splunk Enterprise (critical 9.8)
- [CVE-2017-17067](https://insights.sbomify.com/CVE-2017-17067/): Auth bypass in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20389 and fix it if it is affected.

What it is: CVE-2025-20389 is a medium-severity denial of service vulnerability in Splunk Splunk, published on 3 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-20389 in the wild and no public exploit code.

Affected product: Splunk Splunk. 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-2025-20389/ (Markdown: https://insights.sbomify.com/CVE-2025-20389/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20389
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20389
- OSV: https://osv.dev/vulnerability/CVE-2025-20389

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20389/
Summaries are generated and may contain mistakes; the official description above is the record.