CVE-2021-45655: NETGEAR R6400 devices before 1.0.1.70 are affected by server-side injection.

Q: How do I fix CVE-2021-45655?

r6400 firmware: upgrade to 1.0.1.70. Exact commands for each OS are on this page.

Q: Is CVE-2021-45655 being exploited?

CVE-2021-45655 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-45655 affect?

CVE-2021-45655 affects r6400 firmware. Severity is medium (CVSS 6.9). NETGEAR R6400 devices before 1.0.1.70 are affected by server-side injection.

Q: How urgent is CVE-2021-45655?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 6.9UPGRADE

CVE-2021-45655 is a medium-severity flaw (CVSS 6.9) affecting r6400 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NETGEAR R6400 devices before 1.0.1.70 are affected by server-side injection.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.9 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-74
Published	2021-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netgear

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

Am I affected?

Timeline

2021-12-26 01:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

netgear r6400 firmware UPGRADE

Affected: < 1.0.1.70

Fixed in: 1.0.1.70

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 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-2021-45655?

r6400 firmware: upgrade to 1.0.1.70. Exact commands for each OS are on this page.

Is CVE-2021-45655 being exploited?

CVE-2021-45655 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-2021-45655 affect?

CVE-2021-45655 affects r6400 firmware. Severity is medium (CVSS 6.9). NETGEAR R6400 devices before 1.0.1.70 are affected by server-side injection.

How urgent is CVE-2021-45655?

Priority 34/100. No elevated risk signals yet.

Software pages

Netgear vulnerabilities

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References

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