# CVE-2019-10891: Command injection in n/a

> Remote attackers can execute arbitrary shell commands on D-Link DIR-806 routers via a specially crafted HTTP header due to insufficient input validation.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Sep 2019
- **Updated:** 9 Jan 2025
- **Also known as:** GHSA-frjj-4mjw-3gmf

## What is CVE-2019-10891?

CVE-2019-10891 is a critical command injection vulnerability in n/a, published on 6 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in D-Link DIR-806 devices. There is a command injection in function hnap_main, which calls system() without checking the parameter that can be controlled by user, and finally allows remote attackers to execute arbitrary shell commands with a special HTTP header.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2019-10891?

It affects 1 product.


Products: Dlink Dir-806 Firmware.

## How do I fix CVE-2019-10891?

No fix has been published for CVE-2019-10891 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-10891 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-10891 exists.

## Other vulnerabilities in n/a

- [CVE-2023-43129](https://insights.sbomify.com/CVE-2023-43129/): Command injection in n/a (critical 9.8)
- [CVE-2023-43130](https://insights.sbomify.com/CVE-2023-43130/): Command injection in n/a (critical 9.8)
- [CVE-2023-43128](https://insights.sbomify.com/CVE-2023-43128/): Command injection in n/a (critical 9.8)
- [CVE-2019-10892](https://insights.sbomify.com/CVE-2019-10892/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-4340](https://insights.sbomify.com/CVE-2025-4340/): D-Link DIR-890L/DIR-806A1 soap.cgi sub_175C8 command injection (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-10891 and fix it if it is affected.

What it is: CVE-2019-10891 is a critical command injection vulnerability in n/a, published on 6 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-10891 exists.

Affected product: n/a. 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-2019-10891/ (Markdown: https://insights.sbomify.com/CVE-2019-10891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-10891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-10891
- OSV: https://osv.dev/vulnerability/CVE-2019-10891

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-10891/
Summaries are generated and may contain mistakes; the official description above is the record.