Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker.

published 2020-04-28 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13730

cvss: 8.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

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, EX2700 before 1.0.1.28, R6100 before 1.0.1.20, R7500 before 1.0.0.118, R7500v2 before 1.0.3.24, R7800 before 1.0.2.40, R9000 before 1.0.2.52, WN2000RPTv3 before 1.0.1.20, WN3000RPv3 before 1.0.2.50, WN3100RPv2 before 1.0.0.56, 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.

Patch / fix

fixed in 15

netgear d3600_firmware 1.0.0.67
netgear d6000_firmware 1.0.0.67
netgear d6100_firmware 1.0.0.56
netgear d7800_firmware 1.0.1.30
netgear ex2700_firmware 1.0.1.28
netgear r6100_firmware 1.0.1.20
netgear r7500_firmware 1.0.0.118, 1.0.3.24
netgear r7800_firmware 1.0.2.40
netgear r900_firmware 1.0.2.52
netgear wn2000rpt_firmware 1.0.1.20
netgear wn3000rp_firmware 1.0.2.50
netgear wn3100rp_firmware 1.0.0.56
netgear wndr3700_firmware 1.0.2.96
netgear wndr4300_firmware 1.0.0.50, 1.0.2.98
netgear wndr4500_firmware 1.0.0.50

Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.8	CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N
NVD	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.0	8.8	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	5.8	AV:A/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input

References

kb.netgear.com /000055137/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV
vendor-advisory

Sources

CVE List CVE-2018-21212
NVD CVE-2018-21212

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary