HOMEVULNERABILITIESCVE-2021-34865
HIGH

CVE-2021-34865

CWE-287Published: January 25, 2022· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13313.

NVD Source

Technical Analysis

CVE-2021-34865 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

netgear34 product(s)
ac2100 firmwareac2100ac2400 firmwareac2400ac2600 firmwareac2600d7000v1 firmwared7000v1r6220 firmwarer6220r6230 firmwarer6230+22
Source: NVD CPE · 34 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/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1051/
ADVISORYhttps://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1051/

All References (4)

→
https://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955Vendor Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-21-1051/Third Party Advisory · VDB Entry
→
https://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955Vendor Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-21-1051/Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2021-34865
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedJan 25, 2022

Related CVEs (CWE-287)

CVE-2011-1519
10.0
CVE-2025-63224
10.0
CVE-2021-32637
10.0
CVE-2021-21538
10.0
CVE-2002-2417
10.0
CVE-2025-63216
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-34865 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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