Is CVE-2021-21901 actively exploited?

No active exploitation of CVE-2021-21901 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21901 be exploited remotely?

Yes. CVE-2021-21901 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21901?

CVE-2021-21901 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2021-21901

HIGH

CVE-2021-21901

CWE-120Published: December 22, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

A stack-based buffer overflow vulnerability exists in the CMA check_udp_crc function of Garrett Metal Detectors’ iC Module CMA Version 5.0. A specially-crafted packet can lead to a stack-based buffer overflow during a call to memcpy. An attacker can send a malicious packet to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-21901 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 8.8.