What’s Vulnerable › Vulnerabilities

CVE-2020-27867

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-12 · updated 2026-06-17
• Weakness: CWE-77

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 products

• NETGEAR Ac2100 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR Ac2400 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR Ac2600 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R6020 Firmware: before 1.0.0.48 — fixed in 1.0.0.48
• NETGEAR R6080 Firmware: before 1.0.0.48 — fixed in 1.0.0.48
• NETGEAR R6120 Firmware: before 1.0.0.76 — fixed in 1.0.0.76
• NETGEAR R6220 Firmware: before 1.1.0.104 — fixed in 1.1.0.104
• NETGEAR R6230 Firmware: before 1.1.0.104 — fixed in 1.1.0.104
• NETGEAR R6260: before 1.1.0.78 — fixed in 1.1.0.78
• NETGEAR R6330 Firmware: before 1.1.0.78 — fixed in 1.1.0.78
• NETGEAR R6350 Firmware: before 1.1.0.78 — fixed in 1.1.0.78
• NETGEAR R6700: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R6800 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R6850 Firmware: before 1.1.0.78 — fixed in 1.1.0.78
• NETGEAR R6900 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R7200 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R7350 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R7400 Firmware: before 1.2.0.76 — fixed in 1.2.0.76
• NETGEAR R7450 Firmware: before 1.2.0.76 — fixed in 1.2.0.76

How to fix

Upgrade to a fixed version: NETGEAR Ac2100 Firmware 1.2.0.76; NETGEAR Ac2400 Firmware 1.2.0.76; NETGEAR Ac2600 Firmware 1.2.0.76; NETGEAR R6020 Firmware 1.0.0.48; NETGEAR R6080 Firmware 1.0.0.48; NETGEAR R6120 Firmware 1.0.0.76; NETGEAR R6220 Firmware 1.1.0.104; NETGEAR R6230 Firmware 1.1.0.104; NETGEAR R6260 1.1.0.78; NETGEAR R6330 Firmware 1.1.0.78; NETGEAR R6350 Firmware 1.1.0.78; NETGEAR R6700 1.2.0.76. Check the vendor advisory for mitigations.

References

• https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers
• https://www.zerodayinitiative.com/advisories/ZDI-20-1423/
• https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers
• https://www.zerodayinitiative.com/advisories/ZDI-20-1423/

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