# CVE-2025-1877: D-Link DAP-1562 HTTP POST Request pure_auth_check null pointer dereference

> Remote attackers can cause a denial of service via null pointer dereference in the HTTP POST handler of unsupported D-Link DAP-1562 devices.

- **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:** 3 Mar 2025
- **Updated:** 3 Mar 2025
- **Also known as:** GHSA-rf73-69vr-qxgj

## What is CVE-2025-1877?

CVE-2025-1877 is a high-severity vulnerability in D-Link DAP-1562, published on 3 Mar 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 critical, was found in D-Link DAP-1562 1.10. This affects the function pure_auth_check of the component HTTP POST Request Handler. The manipulation of the argument a1 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. This vulnerability only affects products that are no longer supported by the maintainer.

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

## Which versions are affected by CVE-2025-1877?

It affects 1 product.


Products: Dlink Dap-1562 Firmware.

## How do I fix CVE-2025-1877?

No fix has been published for CVE-2025-1877 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-1877 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-1877 exists.

## Other vulnerabilities in D-Link DAP-1562

- [CVE-2025-1876](https://insights.sbomify.com/CVE-2025-1876/): D-Link DAP-1562 HTTP Header http_request_parse stack-based overflow (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-1877 and fix it if it is affected.

What it is: CVE-2025-1877 is a high-severity vulnerability in D-Link DAP-1562, published on 3 Mar 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-2025-1877 exists.

Affected product: D-Link DAP-1562. 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-2025-1877/ (Markdown: https://insights.sbomify.com/CVE-2025-1877/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-1877
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-1877
- OSV: https://osv.dev/vulnerability/CVE-2025-1877

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-1877/
Summaries are generated and may contain mistakes; the official description above is the record.