# CVE-2025-7836: D-Link DIR-816L Environment Variable cgibin lxmldbc_system command injection

> Remote attackers can execute arbitrary commands on unsupported D-Link DIR-816L routers via a command injection flaw in the cgibin handler.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** 19 Jul 2025
- **Updated:** 21 Jul 2025
- **Also known as:** GHSA-fwww-pvgq-792r

## What is CVE-2025-7836?

CVE-2025-7836 is a medium-severity command injection vulnerability in D-Link DIR-816L, published on 19 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been found in D-Link DIR-816L up to 2.06B01 and classified as critical. Affected by this vulnerability is the function lxmldbc_system of the file /htdocs/cgibin of the component Environment Variable Handler. The manipulation leads to command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2025-7836?

It affects 1 product.


Products: Dlink Dir-816l Firmware.

## How do I fix CVE-2025-7836?

No fix has been published for CVE-2025-7836 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-7836 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7836 exists.

## Other vulnerabilities in D-Link DIR-816L

- [CVE-2022-28956](https://insights.sbomify.com/CVE-2022-28956/): Auth bypass in n/a (critical 9.8)
- [CVE-2020-15893](https://insights.sbomify.com/CVE-2020-15893/): Command injection in n/a (critical 9.8)
- [CVE-2025-13188](https://insights.sbomify.com/CVE-2025-13188/): D-Link DIR-816L authentication.cgi authenticationcgi_main stack-based overflow (critical 9.3)
- [CVE-2025-13189](https://insights.sbomify.com/CVE-2025-13189/): D-Link DIR-816L gena.cgi genacgi_main stack-based overflow (high 8.7)
- [CVE-2025-13190](https://insights.sbomify.com/CVE-2025-13190/): D-Link DIR-816L __ajax_exporer.sgi scandir_main stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7836 and fix it if it is affected.

What it is: CVE-2025-7836 is a medium-severity command injection vulnerability in D-Link DIR-816L, published on 19 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7836 exists.

Affected product: D-Link DIR-816L. 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-2025-7836/ (Markdown: https://insights.sbomify.com/CVE-2025-7836/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7836
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7836
- OSV: https://osv.dev/vulnerability/CVE-2025-7836

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7836/
Summaries are generated and may contain mistakes; the official description above is the record.