CVE-2026-0404: An insufficient input validation vulnerability in NETGEAR Orbi devices'
DHCPv6 functionality allows network a
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HIGH 8.0UPGRADEUPGRADEUPGRADE
CVE-2026-0404 is a high-severity flaw (CVSS 8.0) affecting rbr750 firmware, rbr840 firmware, rbr850 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An insufficient input validation vulnerability in NETGEAR Orbi devices'
DHCPv6 functionality allows network adjacent attackers authenticated
over WiFi or on LAN to execute OS command injections on the router.
DHCPv6 is not enabled by default.
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 rbr750 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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 rbr840 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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 rbr850 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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 rbr860 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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 rbs750 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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 rbs840 firmware UPGRADE
Affected: < 7.2.8.5
Fixed in: 7.2.8.5
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-2026-0404?
rbr750 firmware: upgrade to 7.2.8.5; rbr840 firmware: upgrade to 7.2.8.5; rbr850 firmware: upgrade to 7.2.8.5. Exact commands for each OS are on this page.
Is CVE-2026-0404 being exploited?
CVE-2026-0404 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-2026-0404 affect?
CVE-2026-0404 affects rbr750 firmware, rbr840 firmware, rbr850 firmware. Severity is high (CVSS 8.0). An insufficient input validation vulnerability in NETGEAR Orbi devices'
DHCPv6 functionality allows network adjacent attackers authenticated
over WiFi or on LAN to execute OS command injections on the router.
DHCPv6 is not enabled by def
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