CVE-2020-27866

Authentication bypass via incorrect protected-page string matching

Published Feb 11, 2021 · Updated Aug 4, 2024

Authentication bypass in NETGEAR router firmware 1.2.0.62_1.0.1 allows network-adjacent attackers to access protected web pages. The mini_httpd service on TCP port 80 incorrectly matches requested protected-page strings, allowing an alternate path around authentication. No authentication is required from the local network, and the bypass can be chained with separate flaws to execute code as root; alone, it defeats web-interface access control.

CVSS severity8.8
High
EPSS probability8.66%
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 router firmware 1.2.0.62_1.0.1 allows network-adjacent attackers to access protected web pages. The mini_httpd service on TCP port 80 incorrectly matches requested protected-page strings, allowing an alternate path around authentication. No authentication is required from the local network, and the bypass can be chained with separate flaws to execute code as root; alone, it defeats web-interface access control.

The record

CVE
CVE-2020-27866
Published
Feb 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-288, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2021CVE 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

8.8Trend Micro Zero Day InitiativeCVSS:3.0/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.

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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-288Authentication Bypass Using an Alternate Path or Channel
T1210Exploitation of Remote Services

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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