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Fencer Intel
high 8.8

CVE-2021-34865 json

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers.

published 4y ago modified 4mo ago also EUVD-2021-21512

cvss
8.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13313.

Patch / fix

  • netgear ac2100_firmware 1.2.0.88
  • netgear ac2400_firmware 1.2.0.88
  • netgear ac2600_firmware 1.2.0.88
  • netgear d7000v1_firmware 1.0.1.80
  • netgear r6220_firmware 1.1.0.110
  • netgear r6230_firmware 1.1.0.110
  • netgear r6260_firmware 1.1.0.84
  • netgear r6330_firmware 1.1.0.84
  • netgear r6350_firmware 1.1.0.84
  • netgear r6700v2_firmware 1.2.0.88
  • netgear r6800_firmware 1.2.0.88
  • netgear r6850_firmware 1.1.0.84
  • netgear r6900v2_firmware 1.2.0.88
  • netgear r7200_firmware 1.2.0.88
  • netgear r7350_firmware 1.2.0.88
  • netgear r7400_firmware 1.2.0.88
  • netgear r7450_firmware 1.2.0.88

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Exploit prediction

3.08% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
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 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 8.3 AV:A/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • NETGEAR Multiple Routers

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.