# CVE-2025-1103: D-Link DIR-823X HTTP POST Request set_wifi_blacklists null pointer dereference

> Remote attackers can cause a denial of service on D-Link DIR-823X routers by triggering a null pointer dereference in the WiFi blacklist handler.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **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:** 7 Feb 2025
- **Updated:** 7 Feb 2025
- **Also known as:** GHSA-244c-33wx-j66j

## What is CVE-2025-1103?

CVE-2025-1103 is a high-severity vulnerability in D-Link DIR-823X, published on 7 Feb 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability, which was classified as problematic, was found in D-Link DIR-823X 240126/240802. This affects the function set_wifi_blacklists of the file /goform/set_wifi_blacklists of the component HTTP POST Request Handler. The manipulation of the argument macList leads to null pointer dereference. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-476 (NULL Pointer Dereference), CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2025-1103?

It affects 1 product.


Products: Dlink Dir-823x Firmware.

## How do I fix CVE-2025-1103?

No fix has been published for CVE-2025-1103 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-1103 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-1103 exists.

## Other vulnerabilities in D-Link DIR-823X

- [CVE-2025-29635](https://insights.sbomify.com/CVE-2025-29635/): D-Link DIR-823X Command Injection (high 7.2, exploited in the wild)
- [CVE-2025-29040](https://insights.sbomify.com/CVE-2025-29040/): Command injection in n/a (critical 9.8)
- [CVE-2025-29041](https://insights.sbomify.com/CVE-2025-29041/): Command injection in n/a (critical 9.8)
- [CVE-2025-29042](https://insights.sbomify.com/CVE-2025-29042/): Command injection in n/a (critical 9.8)
- [CVE-2025-29043](https://insights.sbomify.com/CVE-2025-29043/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-1103 and fix it if it is affected.

What it is: CVE-2025-1103 is a high-severity vulnerability in D-Link DIR-823X, published on 7 Feb 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-2025-1103 exists.

Affected product: D-Link DIR-823X. 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-2025-1103/ (Markdown: https://insights.sbomify.com/CVE-2025-1103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-1103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-1103
- OSV: https://osv.dev/vulnerability/CVE-2025-1103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-1103/
Summaries are generated and may contain mistakes; the official description above is the record.