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Fencer Vulns
medium 6.8

CVE-2018-21134 json

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

published 2020-04-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13652

cvss
6.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects R6700 before 1.0.1.48, R7900 before 1.0.2.16, R6900 before 1.0.1.48, R7000P before 1.3.1.44, R6900P before 1.3.1.44, R6250 before 1.0.4.30, R6300v2 before 1.0.4.32, R6400 before 1.0.1.44, R6400v2 before 1.0.2.60, R7000 before 1.0.9.34, R7100LG before 1.0.0.48, R7300 before 1.0.0.68, R8000 before 1.0.4.18, R8000P before 1.4.1.24, R7900P before 1.4.1.24, R8500 before 1.0.2.122, R8300 before 1.0.2.122, WN2500RPv2 before 1.0.1.54, EX3700 before 1.0.0.72, EX3800 before 1.0.0.72, EX6000 before 1.0.0.32, EX6100 before 1.0.2.24, EX6120 before 1.0.0.42, EX6130 before 1.0.0.24, EX6150v1 before 1.0.0.42, EX6200 before 1.0.3.88, EX7000 before 1.0.0.66, D7000v2 before 1.0.0.51, D6220 before 1.0.0.46, D6400 before 1.0.0.82, and D8500 before 1.0.3.42.

Patch / fix

  • netgear r6700_firmware 1.0.1.48
  • netgear r7900_firmware 1.0.2.16
  • netgear r6900_firmware 1.0.1.48
  • netgear r7000p_firmware 1.3.1.44
  • netgear r6900p_firmware 1.3.1.44
  • netgear r6250_firmware 1.0.4.30
  • netgear r6300_firmware 1.0.4.32
  • netgear r6400_firmware 1.0.1.44, 1.0.2.60
  • netgear r7000_firmware 1.0.9.34
  • netgear r7100lg_firmware 1.0.0.48
  • netgear r7300_firmware 1.0.0.68
  • netgear r8000_firmware 1.0.4.18
  • netgear r8000p_firmware 1.4.1.24
  • netgear r7900p_firmware 1.4.1.24
  • netgear r8500_firmware 1.0.2.122
  • netgear r8300_firmware 1.0.2.122
  • netgear wn2500rp_firmware 1.0.1.54
  • netgear ex3700_firmware 1.0.0.72
  • netgear ex3800_firmware 1.0.0.72
  • netgear ex6000_firmware 1.0.0.32

Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.8 CVSS:3.0/AC:L/AV:A/A:L/C:H/I:L/PR:L/S:U/UI:N
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.0 6.8 CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

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.