# CVE-2025-3538: D-Link DI-8100 jhttpd auth.asp auth_asp stack-based overflow

> A stack-based buffer overflow in the D-Link DI-8100 router allows local network attackers to execute arbitrary code via the auth.asp callback argument.

- **Severity:** High 8.7 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2025
- **Updated:** 14 Apr 2025
- **Also known as:** GHSA-w9rr-95wc-r9jf

## What is CVE-2025-3538?

CVE-2025-3538 is a high-severity memory corruption vulnerability in D-Link DI-8100, published on 13 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was found in D-Link DI-8100 16.07.26A1. It has been rated as critical. This issue affects the function auth_asp of the file /auth.asp of the component jhttpd. The manipulation of the argument callback leads to stack-based buffer overflow. The attack needs to be approached within the local network. 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-2025-3538?

It affects 1 product.


Products: Dlink Di-8100 Firmware.

## How do I fix CVE-2025-3538?

No fix has been published for CVE-2025-3538 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3538 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3538 exists.

## Other vulnerabilities in D-Link DI-8100

- [CVE-2025-44083](https://insights.sbomify.com/CVE-2025-44083/): Auth bypass in n/a (critical 9.8)
- [CVE-2026-7853](https://insights.sbomify.com/CVE-2026-7853/): D-Link DI-8100 HTTP auto_reboot.asp sprintf buffer overflow (critical 9.3)
- [CVE-2026-7854](https://insights.sbomify.com/CVE-2026-7854/): D-Link DI-8100 POST Parameter url_rule.asp url_rule_asp buffer overflow (critical 9.3)
- [CVE-2026-7248](https://insights.sbomify.com/CVE-2026-7248/): D-Link DI-8100 CGI Endpoint tgfile.htm tgfile_htm buffer overflow (critical 9.3)
- [CVE-2026-7855](https://insights.sbomify.com/CVE-2026-7855/): D-Link DI-8100 HTTP Request tggl.asp tggl_asp buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3538 and fix it if it is affected.

What it is: CVE-2025-3538 is a high-severity memory corruption vulnerability in D-Link DI-8100, published on 13 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3538 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-2025-3538/ (Markdown: https://insights.sbomify.com/CVE-2025-3538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3538
- OSV: https://osv.dev/vulnerability/CVE-2025-3538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3538/
Summaries are generated and may contain mistakes; the official description above is the record.