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Fencer Vulns
high 8.8

CVE-2018-21206 json

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

published 2020-04-28 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13724

cvss
8.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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

  • 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

0.66% chance of exploitation in the next 30 days, higher than 51% 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

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.