HOMEVULNERABILITIESCVE-2020-26921
HIGH

CVE-2020-26921

CWE-287Published: October 9, 2020· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by authentication bypass. This affects GS110EMX before 1.0.1.7, GS810EMX before 1.7.1.3, XS512EM before 1.0.1.3, and XS724EM before 1.0.1.3.

NVD Source

Technical Analysis

CVE-2020-26921 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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 8.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

netgear8 product(s)
gs110emx firmwaregs110emxgs810emx firmwaregs810emxxs512em firmwarexs512emxs724em firmwarexs724em
Source: NVD CPE · 8 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

ADVISORYhttps://kb.netgear.com/000062332/Security-Advisory-for-Authentication-Bypass-on-Some-Smart-Managed-Plus-Switches-PSV-2020-0305
ADVISORYhttps://kb.netgear.com/000062332/Security-Advisory-for-Authentication-Bypass-on-Some-Smart-Managed-Plus-Switches-PSV-2020-0305

All References (2)

→
https://kb.netgear.com/000062332/Security-Advisory-for-Authentication-Bypass-on-Some-Smart-Managed-Plus-Switches-PSV-2020-0305Vendor Advisory
→
https://kb.netgear.com/000062332/Security-Advisory-for-Authentication-Bypass-on-Some-Smart-Managed-Plus-Switches-PSV-2020-0305Vendor Advisory

Quick Facts

CVE IDCVE-2020-26921
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedOct 9, 2020

Related CVEs (CWE-287)

CVE-2010-4279
10.0
CVE-2011-4051
10.0
CVE-2013-1080
10.0
CVE-2008-0960
10.0
CVE-2002-2417
10.0
CVE-2011-2963
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-26921 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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