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Fencer Vulns
medium 6.8

CVE-2020-27867 json

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6020, R6080, R6120, R6…

published 2021-02-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20360

cvss
6.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. When parsing the funjsq_access_token parameter, the process does not properly validate a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11653.

Patch / fix

  • netgear ac2100_firmware 1.2.0.76
  • netgear ac2400_firmware 1.2.0.76
  • netgear ac2600_firmware 1.2.0.76
  • netgear r6700_firmware 1.2.0.76
  • netgear r6800_firmware 1.2.0.76
  • netgear r6900_firmware 1.2.0.76
  • netgear r7200_firmware 1.2.0.76
  • netgear r7350_firmware 1.2.0.76
  • netgear r7400_firmware 1.2.0.76
  • netgear r7450_firmware 1.2.0.76
  • netgear r6220_firmware 1.1.0.104
  • netgear r6230_firmware 1.1.0.104
  • netgear r6260_firmware 1.1.0.78
  • netgear r6330_firmware 1.1.0.78
  • netgear r6350_firmware 1.1.0.78
  • netgear r6850_firmware 1.1.0.78
  • netgear r6120_firmware 1.0.0.76
  • netgear r6020_firmware 1.0.0.48
  • netgear r6080_firmware 1.0.0.48

Exploit prediction

2.33% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.8 CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.8 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.7 AV:A/AC:L/Au:S/C:C/I:C/A:C

Affected products

  • NETGEAR Multiple Routers

Classification

Weakness
  • CWE-77 Improper Neutralization of Special Elements used in a Command

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.