# CVE-2025-4883: D-Link DI-8100 Connection Limit Page ctxz.asp ctxz_asp stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the D-Link DI-8100 router's connection limit page, potentially leading to arbitrary code execution.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 May 2025
- **Updated:** 19 May 2025
- **Also known as:** GHSA-rc3j-9c9w-j5qc

## What is CVE-2025-4883?

CVE-2025-4883 is a high-severity memory corruption vulnerability in D-Link DI-8100, published on 18 May 2025. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability was found in D-Link DI-8100 16.07.26A1. It has been declared as critical. This vulnerability affects the function ctxz_asp of the file /ctxz.asp of the component Connection Limit Page. The manipulation of the argument def/defTcp/defUdp/defIcmp/defOther leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-4883?

It affects 1 product.


Products: Dlink Di-8100g Firmware.

## How do I fix CVE-2025-4883?

No fix has been published for CVE-2025-4883 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-4883 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4883 exists.

## Other vulnerabilities in D-Link DI-8100

- [CVE-2025-44084](https://insights.sbomify.com/CVE-2025-44084/): Command injection in n/a (critical 9.8)
- [CVE-2024-44401](https://insights.sbomify.com/CVE-2024-44401/): Command injection in n/a (critical 9.8)
- [CVE-2024-44402](https://insights.sbomify.com/CVE-2024-44402/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-4883 and fix it if it is affected.

What it is: CVE-2025-4883 is a high-severity memory corruption vulnerability in D-Link DI-8100, published on 18 May 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4883 exists.

Affected product: D-Link DI-8100. 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-2025-4883/ (Markdown: https://insights.sbomify.com/CVE-2025-4883/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-4883
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-4883
- OSV: https://osv.dev/vulnerability/CVE-2025-4883

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-4883/
Summaries are generated and may contain mistakes; the official description above is the record.