What’s Vulnerable › Vulnerabilities

CVE-2018-21147

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-21 · 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 D7800 before 1.0.1.34, R7500v2 before 1.0.3.26, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR4300v2 before 1.0.0.54, and WNDR4500v3 before 1.0.0.54.

Affected products

• NETGEAR D7800 Firmware: before 1.0.1.34 — fixed in 1.0.1.34
• NETGEAR R7500 Firmware: before 1.0.3.26 — fixed in 1.0.3.26
• NETGEAR R7800 Firmware: before 1.0.2.42 — fixed in 1.0.2.42
• NETGEAR R8900 Firmware: before 1.0.3.10 — fixed in 1.0.3.10
• NETGEAR R9000 Firmware: before 1.0.3.10 — fixed in 1.0.3.10
• NETGEAR Wndr4300 Firmware: before 1.0.0.54 — fixed in 1.0.0.54
• Netgear WNDR4500: before 1.0.0.54 — fixed in 1.0.0.54

How to fix

Upgrade to a fixed version: NETGEAR D7800 Firmware 1.0.1.34; NETGEAR R7500 Firmware 1.0.3.26; NETGEAR R7800 Firmware 1.0.2.42; NETGEAR R8900 Firmware 1.0.3.10; NETGEAR R9000 Firmware 1.0.3.10; NETGEAR Wndr4300 Firmware 1.0.0.54; Netgear WNDR4500 1.0.0.54. Check the vendor advisory for mitigations.

References

• https://kb.netgear.com/000059486/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3158
• https://kb.netgear.com/000059486/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3158

Get alerted when CVE-2018-21147 or the next vulnerability affects your stack