What’s Vulnerable › Vulnerabilities

CVE-2018-21171

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-27 · updated 2026-06-17
• Weakness: CWE-787

Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects D6100 before 1.0.0.57, R7800 before 1.0.2.40, R9000 before 1.0.3.6, WNDR3700v4 before 1.0.2.92, and WNDR4300 before 1.0.2.98.

Affected products

• NETGEAR D6100 Firmware: before 1.0.0.57 — fixed in 1.0.0.57
• NETGEAR R7800 Firmware: before 1.0.2.40 — fixed in 1.0.2.40
• NETGEAR R9000 Firmware: before 1.0.2.40 — fixed in 1.0.2.40
• NETGEAR Wndr3700 Firmware: before 1.0.2.92 — fixed in 1.0.2.92
• NETGEAR Wndr4300 Firmware: before 1.0.2.98 — fixed in 1.0.2.98

How to fix

Upgrade to a fixed version: NETGEAR D6100 Firmware 1.0.0.57; NETGEAR R7800 Firmware 1.0.2.40; NETGEAR R9000 Firmware 1.0.2.40; NETGEAR Wndr3700 Firmware 1.0.2.92; NETGEAR Wndr4300 Firmware 1.0.2.98. Check the vendor advisory for mitigations.

References

• https://kb.netgear.com/000055187/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2632
• https://kb.netgear.com/000055187/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2632

Get alerted when CVE-2018-21171 or the next vulnerability affects your stack