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Fencer Vulns
medium 6.3

CVE-2018-21155 json

Certain NETGEAR devices are affected by stored XSS.

published 2020-04-27 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13673

cvss
6.3
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 56%
public exploits
0
none known

Summary

Certain NETGEAR devices are affected by stored XSS. This affects D7800 before 1.0.1.34, DM200 before 1.0.0.52, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7500v2 before 1.0.3.26, R7800 before 1.0.2.42, R8900 before 1.0.4.2, R9000 before 1.0.3.16, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.54, WNDR4500v3 before 1.0.0.54, and WNR2000v5 before 1.0.0.64.

Patch / fix

  • netgear d7800_firmware 1.0.1.34
  • netgear dm200_firmware 1.0.0.52
  • netgear r6100_firmware 1.0.1.22
  • netgear r7500_firmware 1.0.0.122, 1.0.3.26
  • netgear r7800_firmware 1.0.2.42
  • netgear r8900_firmware 1.0.4.2
  • netgear r9000_firmware 1.0.3.16
  • netgear wndr4300_firmware 1.0.0.54, 1.0.2.98
  • netgear wndr4500_firmware 1.0.0.54
  • netgear wnr2000_firmware 1.0.0.64

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.3 CVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:R
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.0 6.3 CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.