CVE-2021-45529: Certain NETGEAR devices are affected by a buffer overflow by an authenticated user

Q: How do I fix CVE-2021-45529?

cbr40 firmware: upgrade to 2.3.5.12; d7000v2 firmware: upgrade to 1.0.0.66; d8500 firmware: upgrade to 1.0.3.58. Exact commands for each OS are on this page.

Q: Is CVE-2021-45529 being exploited?

CVE-2021-45529 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-2021-45529 affect?

CVE-2021-45529 affects cbr40 firmware, d7000v2 firmware, d8500 firmware. Severity is high (CVSS 7.3). Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects CBR40 before 2.3.5.12, D7000v2 before 1.0.0.66, D8500 before 1.0.3.58, R6400 before 1.0.1.70, R7000 before 1.0.11.126, R6900P before 1.3.2.124,

Routine

HIGH 7.3UPGRADEUPGRADEUPGRADE

CVE-2021-45529 is a high-severity flaw (CVSS 7.3) affecting cbr40 firmware, d7000v2 firmware, d8500 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 buffer overflow by an authenticated user. This affects CBR40 before 2.3.5.12, D7000v2 before 1.0.0.66, D8500 before 1.0.3.58, R6400 before 1.0.1.70, R7000 before 1.0.11.126, R6900P before 1.3.2.124, R7000P before 1.3.2.124, R7900 before 1.0.4.30, R8000 before 1.0.4.52, and WNR3500Lv2 before 1.2.0.62.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-120
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 cbr40 firmware UPGRADE

Affected: < 2.3.5.12

Fixed in: 2.3.5.12

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 d7000v2 firmware UPGRADE

Affected: < 1.0.0.66

Fixed in: 1.0.0.66

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 d8500 firmware UPGRADE

Affected: < 1.0.3.58

Fixed in: 1.0.3.58

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 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 r7000p firmware UPGRADE

Affected: < 1.3.2.124

Fixed in: 1.3.2.124

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-2021-45529?

cbr40 firmware: upgrade to 2.3.5.12; d7000v2 firmware: upgrade to 1.0.0.66; d8500 firmware: upgrade to 1.0.3.58. Exact commands for each OS are on this page.

Is CVE-2021-45529 being exploited?

CVE-2021-45529 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-2021-45529 affect?

CVE-2021-45529 affects cbr40 firmware, d7000v2 firmware, d8500 firmware. Severity is high (CVSS 7.3). Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects CBR40 before 2.3.5.12, D7000v2 before 1.0.0.66, D8500 before 1.0.3.58, R6400 before 1.0.1.70, R7000 before 1.0.11.126, R6900P before 1.3.2.124,

How urgent is CVE-2021-45529?

Priority 36/100. High severity

Software pages

Netgear vulnerabilities

Related CVEs

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CVE-2021-45667 MEDIUM 6.5 UPGRADE UPGRADE Certain NETGEAR devices are affected by stored XSS
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References

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