CVE-2021-38690 vulnerability in QNAP Products
Published on January 14, 2022
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
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
Vulnerability Analysis
CVE-2021-38690 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2021-38690 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2021-38690
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Affected Versions
QNAP Systems Inc. QVR Elite:- Version unspecified and below 2.1.4.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.4.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.4.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.4.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.3.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.3.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.3.0 (2021/12/06) is affected.
- Version unspecified and below 2.1.3.0 (2021/12/06) is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.