CVE-2018-21220

HIGH

8.8

CVSS Score

Published: April 28, 2020 at 03:46 PM UTC

Updated: June 17, 2026 at 01:54 AM UTC

22 products affected across 1 vendorR9000 FirmwareD7800 FirmwareR7500 Firmware

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Severity

HIGH8.8

Exploit prediction

EPSS 0.7%

Description

Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before 1.0.0.67, D6000 before 1.0.0.67, D6100 before 1.0.0.56, D7800 before 1.0.1.30, R6100 before 1.0.1.20, R7500 before 1.0.0.118, R7500v2 before 1.0.3.24, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.50, WNDR4500v3 before 1.0.0.50, and WNR2000v5 before 1.0.0.62.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

D3600 Firmware · NETGEAR

95%

v < 1.0.0.67

Affected range stops below 1.0.0.67, so it looks safe — our inference, not a vendor statement

netgear-d3600 (same device)

D6000 Firmware · NETGEAR

95%

v < 1.0.0.67

Affected range stops below 1.0.0.67, so it looks safe — our inference, not a vendor statement

netgear-d6000 (same device)

D6100 Firmware · NETGEAR

95%

v < 1.0.0.56

Affected range stops below 1.0.0.56, so it looks safe — our inference, not a vendor statement

netgear-d6100 (same device)

D7800 Firmware · NETGEAR

95%

v < 1.0.1.30

Affected range stops below 1.0.1.30, so it looks safe — our inference, not a vendor statement

netgear-d7800 (same device)

R6100 Firmware · NETGEAR

95%

v < 1.0.1.20

Affected range stops below 1.0.1.20, so it looks safe — our inference, not a vendor statement

netgear-r6100 (same device)

R7500 Firmware · NETGEAR

95%

v < 1.0.0.118v < 1.0.3.24

Affected range stops below 1.0.0.118, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.0.3.24, so it looks safe — our inference, not a vendor statement

netgear-r7500 (same device)

R9000 Firmware · NETGEAR

95%

v < 1.0.2.52

Affected range stops below 1.0.2.52, so it looks safe — our inference, not a vendor statement

netgear-r9000 (same device)

WNDR3700 Firmware · NETGEAR

95%

v < 1.0.2.96

Affected range stops below 1.0.2.96, so it looks safe — our inference, not a vendor statement

netgear-wndr3700 (same device)

WNDR4300 Firmware · NETGEAR

95%

v < 1.0.0.50v < 1.0.2.98

Affected range stops below 1.0.0.50, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.0.2.98, so it looks safe — our inference, not a vendor statement

netgear-wndr4300 (same device)

WNDR4500 Firmware · NETGEAR

95%

v < 1.0.0.50

Affected range stops below 1.0.0.50, so it looks safe — our inference, not a vendor statement

netgear-wndr4500 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.netgear.com/000055117/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2481

References (1)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://kb.netgear.com/000055117/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2481

CVSS

8.8HIGH[email protected]

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-120

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