CVE-2021-21903
CVSS v3
9.8
CRITICAL
EPSS Score
1.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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 strcpy. An attacker can send a malicious packet to trigger this vulnerability.
Technical details
- Published
- 2021-12-22
Frequently asked questions
What is CVE-2021-21903?
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 strcpy. An attacker can send a malicious packet to trigger this vulnerability.
Is CVE-2021-21903 actively exploited?
Active exploitation of CVE-2021-21903 has not been confirmed. Its EPSS score was 1.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-21903?
CVE-2021-21903 has a CVSS v3 base score of 9.8 (CRITICAL severity).
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