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Fencer Intel
high 8.8

CVE-2018-21204 json

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

published 6y ago modified 4mo ago also EUVD-2018-13722

cvss
8.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
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, 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, 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 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 r9000_firmware 1.0.2.52
  • 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

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Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.