# CVE-2025-40634: Stack-based buffer overflow in TP-Link Archer AX50

> A stack-based buffer overflow in the conn-indicator binary allows remote attackers to execute arbitrary code on TP-Link Archer AX50 routers.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:H/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 May 2025
- **Updated:** 20 May 2025
- **Also known as:** GHSA-h754-2839-mqvq

## What is CVE-2025-40634?

CVE-2025-40634 is a critical memory corruption vulnerability in TP-Link Link Archer AX50, published on 20 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Stack-based buffer overflow vulnerability in the 'conn-indicator' binary running as root on the TP-Link Archer AX50 router, in firmware versions prior to 1.0.15 build 241203 rel61480. This vulnerability allows an attacker to execute arbitrary code on the device over LAN and WAN networks.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2025-40634?


## How do I fix CVE-2025-40634?

No fix has been published for CVE-2025-40634 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40634 being exploited?

There is no known exploitation of CVE-2025-40634 in the wild and no public exploit code.

Public exploit code:

- Exploit for stack-based buffer overflow found in the conn-indicator binary in the TP-Link Archer AX50 router (github_poc): https://github.com/hacefresko/CVE-2025-40634

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40634 and fix it if it is affected.

What it is: CVE-2025-40634 is a critical memory corruption vulnerability in TP-Link Link Archer AX50, published on 20 May 2025. 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-2025-40634 in the wild and no public exploit code.

Affected product: TP-Link Link Archer AX50. 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-2025-40634/ (Markdown: https://insights.sbomify.com/CVE-2025-40634/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40634
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40634
- OSV: https://osv.dev/vulnerability/CVE-2025-40634

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40634/
Summaries are generated and may contain mistakes; the official description above is the record.