CVE-2021-38691 Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard

High 8.1 Published 14 Jan 2022 Updated 17 Sep 2024

Attackers can execute arbitrary code on QNAP devices via a stack buffer overflow in QVR surveillance applications.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-38691?

CVE-2021-38691 is a high-severity memory corruption vulnerability in QNAP Systems Inc. QVR Elite, published on 14 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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

Weakness: CWE-787, CWE-120

Which versions are affected by CVE-2021-38691?

It affects 3 products.

Products include Qnap Qvr Elite, Qnap Qvr Guard, Qnap Qvr Pro.

How do I fix CVE-2021-38691?

No fix has been published for CVE-2021-38691 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-38691 being exploited?

There is no known exploitation of CVE-2021-38691 in the wild and no public exploit code.

Sources

Also known as GHSA-98m9-234r-rmcv.