# CVE-2025-48721: QTS, QuTS hero

> Remote attackers with admin access can exploit a buffer overflow in QNAP QTS to modify memory or crash processes.

- **Severity:** Low 1.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jan 2026
- **Updated:** 2 Jan 2026
- **Also known as:** GHSA-cm78-px7f-5m69

## What is CVE-2025-48721?

CVE-2025-48721 is a low-severity memory corruption vulnerability in Qnap Qts, published on 2 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to modify memory or crash processes.

We have already fixed the vulnerability in the following version:
QTS 5.2.8.3332 build 20251128 and later

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2025-48721?

It affects 2 products.


Products: Qnap Qts, Qnap Quts Hero.

## How do I fix CVE-2025-48721?

No fix has been published for CVE-2025-48721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-48721 being exploited?

There is no known exploitation of CVE-2025-48721 in the wild and no public exploit code.

## Other vulnerabilities in Qnap Qts

- [CVE-2020-2509](https://insights.sbomify.com/CVE-2020-2509/): QNAP Network-Attached Storage (NAS) Command Injection (critical 9.8, exploited in the wild)
- [CVE-2018-19949](https://insights.sbomify.com/CVE-2018-19949/): QNAP NAS File Station Command Injection (critical 9.8, exploited in the wild)
- [CVE-2019-7193](https://insights.sbomify.com/CVE-2019-7193/): QNAP QTS Improper Input Validation (critical 9.8, exploited in the wild)
- [CVE-2018-19943](https://insights.sbomify.com/CVE-2018-19943/): QNAP NAS File Station Cross-Site Scripting (high 8.0, exploited in the wild)
- [CVE-2018-19953](https://insights.sbomify.com/CVE-2018-19953/): QNAP NAS File Station Cross-Site Scripting (medium 6.1, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-48721 and fix it if it is affected.

What it is: CVE-2025-48721 is a low-severity memory corruption vulnerability in Qnap Qts, published on 2 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-48721 in the wild and no public exploit code.

Affected product: Qnap Qts. 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-2025-48721/ (Markdown: https://insights.sbomify.com/CVE-2025-48721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-48721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-48721
- OSV: https://osv.dev/vulnerability/CVE-2025-48721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-48721/
Summaries are generated and may contain mistakes; the official description above is the record.