High severity8.8NVD Advisory· Published Apr 28, 2020· Updated Jun 17, 2026

CVE-2018-21203

Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects R6100 before 1.0.1.20, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.50, and WNDR4500v3 before 1.0.0.50.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

NETGEAR/NETGEAR devicesdescription
Netgear/R6100 Firmware
cpe:2.3:o:netgear:r6100_firmware:*:*:*:*:*:*:*:*
Range: <1.0.1.20
Netgear/R9000 Firmware
cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*
Range: <1.0.2.52
Netgear/Wndr3700 Firmware
cpe:2.3:o:netgear:wndr3700_firmware:*:*:*:*:*:*:*:*
Range: <1.0.2.96
Netgear/Wndr4300 Firmware
cpe:2.3:o:netgear:wndr4300_firmware:*:*:*:*:*:*:*:*
Range: <1.0.2.98
Netgear/Wndr4500 Firmware
cpe:2.3:o:netgear:wndr4500_firmware:*:*:*:*:*:*:*:*
Range: <1.0.0.50
Netgear/WNDR4300v2llm-fuzzy
Range: <1.0.0.50
Netgear/R6100llm-fuzzy
Range: <1.0.1.20
Netgear/WNDR4500v3llm-fuzzy
Range: <1.0.0.50
Netgear/R9000llm-fuzzy
Range: <1.0.2.52
Netgear/WNDR3700v4llm-fuzzy
Range: <1.0.2.96
Netgear/WNDR4300llm-fuzzy
Range: <1.0.2.98

Patches

Vulnerability mechanics

References

kb.netgear.com/000055146/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-Some-Routers-PSV-2017-2589nvdVendor Advisory

News mentions

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cvss	0.572
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000