# CVE-2025-11339: D-Link DI-7100G C1 jhttpd hi_block.asp sub_4BD4F8 buffer overflow

> Remote attackers can trigger a buffer overflow in the jhttpd web server via the popupId argument, potentially leading to code execution or service disruption.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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:** 6 Oct 2025
- **Updated:** 6 Oct 2025
- **Also known as:** GHSA-j435-57wh-f697

## What is CVE-2025-11339?

CVE-2025-11339 is a high-severity memory corruption vulnerability in D-Link DI-7100G C1, published on 6 Oct 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 DI-7100G C1 up to 20250928. This issue affects the function sub_4BD4F8 of the file /webchat/hi_block.asp of the component jhttpd. The manipulation of the argument popupId leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-11339?

It affects 1 product.


Products: Dlink Di-7100g C1 Firmware.

## How do I fix CVE-2025-11339?

No fix has been published for CVE-2025-11339 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-11339 being exploited?

There is no known exploitation of CVE-2025-11339 in the wild and no public exploit code.

## Other vulnerabilities in D-Link DI-7100G C1

- [CVE-2025-11338](https://insights.sbomify.com/CVE-2025-11338/): D-Link DI-7100G C1 jhttpd login.cgi sub_4C0990 buffer overflow (high 8.7)
- [CVE-2026-2193](https://insights.sbomify.com/CVE-2026-2193/): D-Link DI-7100G C1 set_jhttpd_info command injection (medium 5.3)
- [CVE-2026-2194](https://insights.sbomify.com/CVE-2026-2194/): D-Link DI-7100G C1 start_proxy_client_email command injection (medium 5.3)
- [CVE-2025-11335](https://insights.sbomify.com/CVE-2025-11335/): D-Link DI-7100G C1 jhttpd msp_info.htm sub_46409C command injection (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-11339 and fix it if it is affected.

What it is: CVE-2025-11339 is a high-severity memory corruption vulnerability in D-Link DI-7100G C1, published on 6 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-11339 in the wild and no public exploit code.

Affected product: D-Link DI-7100G C1. 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-2025-11339/ (Markdown: https://insights.sbomify.com/CVE-2025-11339/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11339
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11339
- OSV: https://osv.dev/vulnerability/CVE-2025-11339

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11339/
Summaries are generated and may contain mistakes; the official description above is the record.