# CVE-2019-25031: Code injection in n/a

> A man-in-the-middle attack on a cleartext HTTP session allows configuration injection in the community-contributed create_unbound_ad_servers.sh script.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Apr 2021
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-25031, GHSA-9vvw-9wr3-56v3, UBUNTU-CVE-2019-25031

## What is CVE-2019-25031?

CVE-2019-25031 is a medium-severity code injection vulnerability in Debian Debian Linux, published on 27 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-in-the-middle attack against a cleartext HTTP session. NOTE: The vendor does not consider this a vulnerability of the Unbound software. create_unbound_ad_servers.sh is a contributed script from the community that facilitates automatic configuration creation. It is not part of the Unbound installation

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2019-25031?

It affects 2 products.


Products: Debian Debian Linux, Nlnetlabs Unbound.

## How do I fix CVE-2019-25031?

Apply the vendor's patch.

## Is CVE-2019-25031 being exploited?

There is no known exploitation of CVE-2019-25031 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25031 and fix it if it is affected.

What it is: CVE-2019-25031 is a medium-severity code injection vulnerability in Debian Debian Linux, published on 27 Apr 2021. 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-2019-25031 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2019-25031/ (Markdown: https://insights.sbomify.com/CVE-2019-25031/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25031
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25031
- OSV: https://osv.dev/vulnerability/CVE-2019-25031

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25031/
Summaries are generated and may contain mistakes; the official description above is the record.