CVE & CISA-KEV Catalog

CVE-2020-27866

HIGHEPSS 94th pctl
8.8
CVSS v3
NVD

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 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 in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-11355.

CWE-288CWE-287Improper Authentication

How to fix

Remediation Available
ac2100 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
ac2400 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
ac2600 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r6020 firmwareNVD
Affected:< 1.0.0.48Fixed in:1.0.0.48CVE-2020-27866derived from NVD
r6080 firmwareNVD
Affected:< 1.0.0.48Fixed in:1.0.0.48CVE-2020-27866derived from NVD
r6120 firmwareNVD
Affected:< 1.0.0.76Fixed in:1.0.0.76CVE-2020-27866derived from NVD
r6220 firmwareNVD
Affected:< 1.1.0.104Fixed in:1.1.0.104CVE-2020-27866derived from NVD
r6230 firmwareNVD
Affected:< 1.1.0.104Fixed in:1.1.0.104CVE-2020-27866derived from NVD
r6260 firmwareNVD
Affected:< 1.1.0.78Fixed in:1.1.0.78CVE-2020-27866derived from NVD
r6330 firmwareNVD
Affected:< 1.1.0.78Fixed in:1.1.0.78CVE-2020-27866derived from NVD
r6350 firmwareNVD
Affected:< 1.1.0.78Fixed in:1.1.0.78CVE-2020-27866derived from NVD
r6700 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r6800 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r6850 firmwareNVD
Affected:< 1.1.0.78Fixed in:1.1.0.78CVE-2020-27866derived from NVD
r6900 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r7200 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r7350 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r7400 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD
r7450 firmwareNVD
Affected:< 1.2.0.76Fixed in:1.2.0.76CVE-2020-27866derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent
Attack ComplexityLow
Privileges RequiredNone
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

Exploit Intelligence

8.66%probability of exploitation in 30 days
94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.