CVE-2021-45620: Certain NETGEAR devices are affected by command injection by an unauthenticated attacker
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CRITICAL 9.6UPGRADEUPGRADEUPGRADE
CVE-2021-45620 is a critical-severity flaw (CVSS 9.6) affecting cbr40 firmware, cbr750 firmware, eax20 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR40 before 2.5.0.24, CBR750 before 4.6.3.6, EAX20 before 1.0.0.58, EAX80 before 1.0.1.68, LAX20 before 1.1.6.28, MR60 before 1.0.6.116, MR80 before 1.1.2.20, MS60 before 1.0.6.116, MS80 before 1.1.2.20, MK62 before 1.0.6.116, MK83 before 1.1.2.20, R6400 before 1.0.1.70, R6400v2 before 1.0.4.106, R6700v3 before 1.0.4.106, R6900P before 1.3.3.14
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
netgear cbr40 firmware UPGRADE
Affected: < 2.5.0.24
Fixed in: 2.5.0.24
Safe to downgrade to: no unaffected older release
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.
netgear cbr750 firmware UPGRADE
Affected: < 4.6.3.6
Fixed in: 4.6.3.6
Safe to downgrade to: no unaffected older release
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.
netgear eax20 firmware UPGRADE
Affected: < 1.0.0.58
Fixed in: 1.0.0.58
Safe to downgrade to: no unaffected older release
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.
netgear eax80 firmware UPGRADE
Affected: < 1.0.1.68
Fixed in: 1.0.1.68
Safe to downgrade to: no unaffected older release
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.
netgear lax20 firmware UPGRADE
Affected: < 1.1.6.28
Fixed in: 1.1.6.28
Safe to downgrade to: no unaffected older release
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.
netgear mr60 firmware UPGRADE
Affected: < 1.0.6.116
Fixed in: 1.0.6.116
Safe to downgrade to: no unaffected older release
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 sourceNVD · 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-2021-45620?
cbr40 firmware: upgrade to 2.5.0.24; cbr750 firmware: upgrade to 4.6.3.6; eax20 firmware: upgrade to 1.0.0.58. Exact commands for each OS are on this page.
Is CVE-2021-45620 being exploited?
CVE-2021-45620 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-2021-45620 affect?
CVE-2021-45620 affects cbr40 firmware, cbr750 firmware, eax20 firmware. Severity is critical (CVSS 9.6). Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR40 before 2.5.0.24, CBR750 before 4.6.3.6, EAX20 before 1.0.0.58, EAX80 before 1.0.1.68, LAX20 before 1.1.6.28, MR60 before 1.0.6.116,
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