# CVE-2021-41436: Other in n/a

> Remote unauthenticated attackers can cause denial of service on ASUS routers via HTTP request smuggling.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Nov 2021
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-j65p-j8h7-7chg

## What is CVE-2021-41436?

CVE-2021-41436 is a high-severity vulnerability in n/a, published on 19 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An HTTP request smuggling in web application in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U, RT-AX82U GUNDAM EDITION, RT-AX86 Series(RT-AX86U/RT-AX86S), RT-AX86U ZAKU II EDITION, RT-AX88U, RT-AX92U, TUF Gaming AX3000, TUF Gaming AX5400 (TUF-AX5400), ASUS ZenWiFi XD6, ASUS ZenWiFi AX (XT8) before 3.0.0.4.386.45898, and RT-AX68U before 3.0.0.4.386.45911, allows a remote unauthenticated attacker to DoS via sending a specially crafted HTTP packet.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2021-41436?

It affects 18 products.


Products: Asus Gt-Ax11000 Firmware, Asus Rt-Ax3000 Firmware, Asus Rt-Ax55 Firmware, Asus Rt-Ax56u Firmware, Asus Rt-Ax56u V2 Firmware, Asus Rt-Ax58u Firmware, Asus Rt-Ax68u Firmware, Asus Rt-Ax82u Firmware, Asus Rt-Ax82u Gundam Edition Firmware, Asus Rt-Ax86s Firmware, Asus Rt-Ax86u Firmware, Asus Rt-Ax86u Zaku Ii Edition Firmware, Asus Rt-Ax88u Firmware, Asus Rt-Ax92u Firmware, Asus Tuf-Ax5400 Firmware, Asus Tuf Gaming Ax3000 Firmware, Asus Zenwifi Ax \(Xt8\) Firmware, Asus Zenwifi Xd6 Firmware.

## How do I fix CVE-2021-41436?

No fix has been published for CVE-2021-41436 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-41436 being exploited?

There is no known exploitation of CVE-2021-41436 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-41435](https://insights.sbomify.com/CVE-2021-41435/): Security feature bypass in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-41436 and fix it if it is affected.

What it is: CVE-2021-41436 is a high-severity vulnerability in n/a, published on 19 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-41436 in the wild and no public exploit code.

Affected product: n/a. 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-2021-41436/ (Markdown: https://insights.sbomify.com/CVE-2021-41436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-41436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-41436
- OSV: https://osv.dev/vulnerability/CVE-2021-41436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-41436/
Summaries are generated and may contain mistakes; the official description above is the record.