CVE-2021-21901: A stack-based buffer overflow vulnerability exists in the CMA check_udp_crc function of Garrett Metal Detector

This month

HIGH 8.8MITIGATE

CVE-2021-21901 is a high-severity flaw (CVSS 8.8) 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 memcpy. An attacker can send a malicious packet to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-120, CWE-787
Published	2021-12-22
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: garrett

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-22 19:15 UTCPublished CVE record published
2026-06-17 03:36 UTCUpdated Record last modified

garrett ic module cma MITIGATE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2021-21901?

ic module cma: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-21901 being exploited?

CVE-2021-21901 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-2021-21901 affect?

CVE-2021-21901 affects ic module cma. Severity is high (CVSS 8.8). 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 memcpy. An att

How urgent is CVE-2021-21901?

Priority 55/100. High severity; Public exploit reference

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-2021-21903 CRITICAL 9.8 MITIGATE A stack-based buffer overflow vulnerability exists in the CMA check_udp_crc function of Garrett Metal Detector

References

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