CVE-2021-45606: Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user

Q: How do I fix CVE-2021-45606?

r6400 firmware: upgrade to 1.0.1.70; r7000 firmware: upgrade to 1.0.11.126; r7900 firmware: upgrade to 1.0.4.46. Exact commands for each OS are on this page.

Q: Is CVE-2021-45606 being exploited?

CVE-2021-45606 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-2021-45606 affect?

CVE-2021-45606 affects r6400 firmware, r7000 firmware, r7900 firmware. Severity is medium (CVSS 4.5). Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R6400 before 1.0.1.70, R7000 before 1.0.11.126, R7900 before 1.0.4.46, R7900P before 1.4.2.84, R7960P before 1.4.2.84, R8000 before

Q: How urgent is CVE-2021-45606?

Priority 31/100. No elevated risk signals yet.

Routine

MEDIUM 4.5UPGRADEUPGRADEUPGRADE

CVE-2021-45606 is a medium-severity flaw (CVSS 4.5) affecting r6400 firmware, r7000 firmware, r7900 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 a stack-based buffer overflow by an authenticated user. This affects R6400 before 1.0.1.70, R7000 before 1.0.11.126, R7900 before 1.0.4.46, R7900P before 1.4.2.84, R7960P before 1.4.2.84, R8000 before 1.0.4.74, R8000P before 1.4.2.84, RAX200 before 1.0.4.120, RS400 before 1.5.1.80, R6400v2 before 1.0.4.118, R7000P before 1.3.3.140, RAX80 before 1.0.4.120, R6700v3 before 1.0.4.118, R6900P before 1.3.3.140, a

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-787
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.

netgear r7000 firmware UPGRADE

Affected: < 1.0.11.126

Fixed in: 1.0.11.126

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 r7900 firmware UPGRADE

Affected: < 1.0.4.46

Fixed in: 1.0.4.46

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 r7900p firmware UPGRADE

Affected: < 1.4.2.84

Fixed in: 1.4.2.84

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 r7960p firmware UPGRADE

Affected: < 1.4.2.84

Fixed in: 1.4.2.84

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 r8000 firmware UPGRADE

Affected: < 1.0.4.74

Fixed in: 1.0.4.74

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-2021-45606?

r6400 firmware: upgrade to 1.0.1.70; r7000 firmware: upgrade to 1.0.11.126; r7900 firmware: upgrade to 1.0.4.46. Exact commands for each OS are on this page.

Is CVE-2021-45606 being exploited?

CVE-2021-45606 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-2021-45606 affect?

CVE-2021-45606 affects r6400 firmware, r7000 firmware, r7900 firmware. Severity is medium (CVSS 4.5). Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R6400 before 1.0.1.70, R7000 before 1.0.11.126, R7900 before 1.0.4.46, R7900P before 1.4.2.84, R7960P before 1.4.2.84, R8000 before

How urgent is CVE-2021-45606?

Priority 31/100. No elevated risk signals yet.

Software pages

Netgear vulnerabilities

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References

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