PatchTheCVECVE-2021-21903: A stack-based buffer overflow vulnerability exists in the CMA check_udp_crc function of Garrett Metal Detector
CVE-2021-21903 is a critical-severity flaw (CVSS 9.8) affecting ic module cma. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-21903?
ic module cma: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-21903 being exploited?
CVE-2021-21903 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-21903 affect?
CVE-2021-21903 affects ic module cma. Severity is critical (CVSS 9.8). 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 att
How urgent is CVE-2021-21903?
Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2021-21907 MEDIUM 4.9 MITIGATE A directory traversal vulnerability exists in the CMA CLI getenv command functionality of Garrett Metal Detect
- CVE-2021-21906 HIGH 7.2 MITIGATE Stack-based buffer overflow vulnerability exists in how the CMA readfile function of Garrett Metal Detectors i
- CVE-2021-21905 HIGH 7.2 MITIGATE Stack-based buffer overflow vulnerability exists in how the CMA readfile function of Garrett Metal Detectors i
- CVE-2021-21904 HIGH 7.2 MITIGATE A directory traversal vulnerability exists in the CMA CLI setenv command of Garrett Metal Detectors’ iC Module
- CVE-2021-21902 HIGH 8.1 MITIGATE An authentication bypass vulnerability exists in the CMA run_server_6877 functionality of Garrett Metal Detect