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Fencer Vulns
high 7.1

CVE-2021-45659 json

Certain NETGEAR devices are affected by server-side injection.

published 2021-12-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32425

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

Certain NETGEAR devices are affected by server-side injection. This affects RBK40 before 2.5.1.16, RBR40 before 2.5.1.16, RBS40 before 2.5.1.16, RBK20 before 2.5.1.16, RBR20 before 2.5.1.16, RBS20 before 2.5.1.16, RBK50 before 2.5.1.16, RBR50 before 2.5.1.16, RBS50 before 2.5.1.16, and RBS50Y before 2.6.1.40.

Patch / fix

  • netgear rbk40_firmware 2.5.1.16
  • netgear rbr40_firmware 2.5.1.16
  • netgear rbs40_firmware 2.5.1.16
  • netgear rbk20_firmware 2.5.1.16
  • netgear rbr20_firmware 2.5.1.16
  • netgear rbs20_firmware 2.5.1.16
  • netgear rbk50_firmware 2.5.1.16
  • netgear rbr50_firmware 2.5.1.16
  • netgear rbs50_firmware 2.5.1.16
  • netgear rbs50y_firmware 2.6.1.40

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AC:L/AV:L/A:N/C:H/I:H/PR:L/S:U/UI:N
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

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.