CVE-2021-34865

Root code execution via mini_httpd auth bypass

Published Jan 25, 2022 · Updated Aug 4, 2024

Authentication bypass in NETGEAR routers allows remote attackers to execute arbitrary code as root through the mini_httpd service. Incorrect string matching when protected pages are requested lets unauthenticated network-adjacent attackers reach privileged actions on TCP port 80. Exploitation requires access to the router's adjacent network; the documented impact includes complete confidentiality, integrity, and availability loss.

CVSS severity8.8
High
EPSS probability3.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in NETGEAR routers allows remote attackers to execute arbitrary code as root through the mini_httpd service. Incorrect string matching when protected pages are requested lets unauthenticated network-adjacent attackers reach privileged actions on TCP port 80. Exploitation requires access to the router's adjacent network; the documented impact includes complete confidentiality, integrity, and availability loss.

The record

CVE
CVE-2021-34865
Published
Jan 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.3NVDAV:A/AC:L/Au:N/C:C/I:C/A:C
8.8NETGEARCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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