CVE-2021-21909: Specially-crafted command line arguments can lead to arbitrary file deletion in the del .cnt|.log file delete

This month

HIGH 8.1MITIGATE

CVE-2021-21909 is a high-severity flaw (CVSS 8.1) affecting ic module firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Specially-crafted command line arguments can lead to arbitrary file deletion in the del .cnt|.log file delete command. An attacker can provide malicious inputs 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	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-22
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 firmware 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-2021-21909?

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

Is CVE-2021-21909 being exploited?

CVE-2021-21909 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-2021-21909 affect?

CVE-2021-21909 affects ic module firmware. Severity is high (CVSS 8.1). Specially-crafted command line arguments can lead to arbitrary file deletion in the del .cnt|.log file delete command. An attacker can provide malicious inputs to trigger this vulnerability

How urgent is CVE-2021-21909?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2021-21908 MEDIUM 6.5 MITIGATE Specially-crafted command line arguments can lead to arbitrary file deletion

References

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