HOMEVULNERABILITIESCVE-2021-45509
CRITICAL

CVE-2021-45509

NVD-CWE-noinfoPublished: December 26, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by authentication bypass. This affects CBR40 before 2.5.0.24, RBK752 before 3.2.17.12, RBR750 before 3.2.17.12, RBS750 before 3.2.17.12, RBK852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.

NVD Source

Technical Analysis

CVE-2021-45509 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

netgear14 product(s)
cbr40 firmwarecbr40rbk752 firmwarerbk752rbr750 firmwarerbr750rbs750 firmwarerbs750rbk852 firmwarerbk852rbr850 firmwarerbr850+2
Source: NVD CPE · 14 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://kb.netgear.com/000064148/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0564
PATCHhttps://kb.netgear.com/000064148/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0564

All References (2)

→
https://kb.netgear.com/000064148/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0564Patch · Vendor Advisory
→
https://kb.netgear.com/000064148/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0564Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2021-45509
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedDec 26, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2015-6787
10.0
CVE-2006-3698
10.0
CVE-2014-2624
10.0
CVE-2010-0071
10.0
CVE-2008-5010
10.0
CVE-2009-3099
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-45509 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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