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CVE-2020-27867

MEDIUM
6.8
CVSS Score
Published: February 11, 2021 at 11:35 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
38 products affected across 1 vendorR6700 FirmwareR6800 FirmwareR6220 Firmware

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Severity
MEDIUM6.8
Exploit prediction
EPSS 2%

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. When parsing the funjsq_access_token parameter, the process does not properly validate a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11653.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

AC2100 Firmware· NETGEAR
95%
v < 1.2.0.76
Affected range stops below 1.2.0.76, so it looks safe — our inference, not a vendor statement
netgear-ac2100 (same device)
AC2400 Firmware· NETGEAR
95%
v < 1.2.0.76
Affected range stops below 1.2.0.76, so it looks safe — our inference, not a vendor statement
netgear-ac2400 (same device)
AC2600 Firmware· NETGEAR
95%
v < 1.2.0.76
Affected range stops below 1.2.0.76, so it looks safe — our inference, not a vendor statement
netgear-ac2600 (same device)
R6020 Firmware· NETGEAR
95%
v < 1.0.0.48
Affected range stops below 1.0.0.48, so it looks safe — our inference, not a vendor statement
netgear-r6020 (same device)
R6080 Firmware· NETGEAR
95%
v < 1.0.0.48
Affected range stops below 1.0.0.48, so it looks safe — our inference, not a vendor statement
netgear-r6080 (same device)
R6120 Firmware· NETGEAR
95%
v < 1.0.0.76
Affected range stops below 1.0.0.76, so it looks safe — our inference, not a vendor statement
netgear-r6120 (same device)
R6220 Firmware· NETGEAR
95%
v < 1.1.0.104
Affected range stops below 1.1.0.104, so it looks safe — our inference, not a vendor statement
netgear-r6220 (same device)
R6230 Firmware· NETGEAR
95%
v < 1.1.0.104
Affected range stops below 1.1.0.104, so it looks safe — our inference, not a vendor statement
netgear-r6230 (same device)
R6260 Firmware· NETGEAR
95%
v < 1.1.0.78
Affected range stops below 1.1.0.78, so it looks safe — our inference, not a vendor statement
netgear-r6260 (same device)
R6330 Firmware· NETGEAR
95%
v < 1.1.0.78
Affected range stops below 1.1.0.78, so it looks safe — our inference, not a vendor statement
netgear-r6330 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-20-1423/

CVSS

6.8MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-77

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