What’s Vulnerable › Vulnerabilities

CVE-2021-34865

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-25 · updated 2026-06-17
• Weakness: CWE-287

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR 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 vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13313.

Affected products

• NETGEAR Ac2100 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR Ac2400 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR Ac2600 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR D7000V1 Firmware: before 1.0.1.80 — fixed in 1.0.1.80
• NETGEAR R6220 Firmware: before 1.1.0.110 — fixed in 1.1.0.110
• NETGEAR R6230 Firmware: before 1.1.0.110 — fixed in 1.1.0.110
• NETGEAR R6260: before 1.1.0.84 — fixed in 1.1.0.84
• NETGEAR R6330 Firmware: before 1.1.0.84 — fixed in 1.1.0.84
• NETGEAR R6350 Firmware: before 1.1.0.84 — fixed in 1.1.0.84
• NETGEAR R6700V2 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R6800 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R6850 Firmware: before 1.1.0.84 — fixed in 1.1.0.84
• NETGEAR R6900V2 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R7200 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R7350 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R7400 Firmware: before 1.2.0.88 — fixed in 1.2.0.88
• NETGEAR R7450 Firmware: before 1.2.0.88 — fixed in 1.2.0.88

How to fix

Upgrade to a fixed version: NETGEAR Ac2100 Firmware 1.2.0.88; NETGEAR Ac2400 Firmware 1.2.0.88; NETGEAR Ac2600 Firmware 1.2.0.88; NETGEAR D7000V1 Firmware 1.0.1.80; NETGEAR R6220 Firmware 1.1.0.110; NETGEAR R6230 Firmware 1.1.0.110; NETGEAR R6260 1.1.0.84; NETGEAR R6330 Firmware 1.1.0.84; NETGEAR R6350 Firmware 1.1.0.84; NETGEAR R6700V2 Firmware 1.2.0.88; NETGEAR R6800 Firmware 1.2.0.88; NETGEAR R6850 Firmware 1.1.0.84. Check the vendor advisory for mitigations.

References

• https://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955
• https://www.zerodayinitiative.com/advisories/ZDI-21-1051/
• https://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955
• https://www.zerodayinitiative.com/advisories/ZDI-21-1051/

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