CVE-2021-45511: Certain NETGEAR devices are affected by authentication bypass

Q: How do I fix CVE-2021-45511?

ac2100 firmware: upgrade to 1.2.0.88; ac2400 firmware: upgrade to 1.2.0.88; ac2600 firmware: upgrade to 1.2.0.88. Exact commands for each OS are on this page.

Q: Is CVE-2021-45511 being exploited?

CVE-2021-45511 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-2021-45511 affect?

CVE-2021-45511 affects ac2100 firmware, ac2400 firmware, ac2600 firmware. Severity is medium (CVSS 6.8). Certain NETGEAR devices are affected by authentication bypass. This affects AC2100 before 2021-08-27, AC2400 before 2021-08-27, AC2600 before 2021-08-27, D7000 before 2021-08-27, R6220 before 2021-08-27, R6230 before 2021-08-27, R6260 befor

Q: How urgent is CVE-2021-45511?

Priority 53/100. EPSS top 3%: very likely to be exploited; Public exploit reference

This week

MEDIUM 6.8UPGRADEUPGRADEUPGRADE

CVE-2021-45511 is a medium-severity flaw (CVSS 6.8) affecting ac2100 firmware, ac2400 firmware, ac2600 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 authentication bypass. This affects AC2100 before 2021-08-27, AC2400 before 2021-08-27, AC2600 before 2021-08-27, D7000 before 2021-08-27, R6220 before 2021-08-27, R6230 before 2021-08-27, R6260 before 2021-08-27, R6330 before 2021-08-27, R6350 before 2021-08-27, R6700v2 before 2021-08-27, R6800 before 2021-08-27, R6850 before 2021-08-27, R6900v2 before 2021-08-27, R7200 before 2021-08-27, R7350 before 2021

Why this priority

EPSS top 3%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	18.9% (top 3%)
CISA exploited list	No
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 ac2100 firmware UPGRADE

Affected: < 1.2.0.88

Fixed in: 1.2.0.88

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 ac2400 firmware UPGRADE

Affected: < 1.2.0.88

Fixed in: 1.2.0.88

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 ac2600 firmware UPGRADE

Affected: < 1.2.0.88

Fixed in: 1.2.0.88

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 d7000 firmware UPGRADE

Affected: < 1.0.1.80

Fixed in: 1.0.1.80

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 r6220 firmware UPGRADE

Affected: < 1.1.0.110

Fixed in: 1.1.0.110

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 r6230 firmware UPGRADE

Affected: < 1.1.0.110

Fixed in: 1.1.0.110

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Netgear PNPX_GetShareFolderList Authentication Bypass

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-2021-45511?

ac2100 firmware: upgrade to 1.2.0.88; ac2400 firmware: upgrade to 1.2.0.88; ac2600 firmware: upgrade to 1.2.0.88. Exact commands for each OS are on this page.

Is CVE-2021-45511 being exploited?

CVE-2021-45511 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-2021-45511 affect?

CVE-2021-45511 affects ac2100 firmware, ac2400 firmware, ac2600 firmware. Severity is medium (CVSS 6.8). Certain NETGEAR devices are affected by authentication bypass. This affects AC2100 before 2021-08-27, AC2400 before 2021-08-27, AC2600 before 2021-08-27, D7000 before 2021-08-27, R6220 before 2021-08-27, R6230 before 2021-08-27, R6260 befor

How urgent is CVE-2021-45511?

Priority 53/100. EPSS top 3%: very likely to be exploited; Public exploit reference

Software pages

Netgear vulnerabilities

Related CVEs

CVE-2021-45644 MEDIUM 6.8 UPGRADE UPGRADE Certain NETGEAR devices are affected by incorrect configuration of security settings
CVE-2021-45637 HIGH 8.3 UPGRADE UPGRADE Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker
CVE-2021-45573 HIGH 8.3 UPGRADE UPGRADE Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker
CVE-2021-45534 HIGH 7.8 UPGRADE UPGRADE Certain NETGEAR devices are affected by command injection by an authenticated user
CVE-2021-34865 HIGH 8.8 UPGRADE UPGRADE This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of mul

References

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