Is CVE-2021-28797 actively exploited?

No active exploitation of CVE-2021-28797 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28797 be exploited remotely?

Yes. CVE-2021-28797 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-28797?

CVE-2021-28797 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-28797

CWE-121Published: April 14, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A stack-based buffer overflow vulnerability has been reported to affect QNAP NAS devices running Surveillance Station. If exploited, this vulnerability allows attackers to execute arbitrary code. QNAP have already fixed this vulnerability in the following versions: Surveillance Station 5.1.5.4.3 (and later) for ARM CPU NAS (64bit OS) and x86 CPU NAS (64bit OS) Surveillance Station 5.1.5.3.3 (and later) for ARM CPU NAS (32bit OS) and x86 CPU NAS (32bit OS)

NVD Source

Technical Analysis

CVE-2021-28797 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.