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CVE-2018-21162: Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.

CVE-2018-21162 is rated critical with a CVSS v3.1 base score of 9.8 and NVD lists 16 affected products, including Netgear D6400 Firmware. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D6400 before 1.0.0.78, EX6200 before 1.0.3.86, EX7000 before 1.0.0.64, R6250 before 1.0.4.8, R6300v2 before 1.0.4.6, R6400 before 1.0.1.12, R6700 before 1.0.1.16, R7000 before 1.0.7.10, R7100LG before 1.0.0.42, R7300DST before 1.0.0.44, R7900 before 1.0.1.12, R8000 before 1.0.3.36, R8300 before 1.0.2.74, R8500 before 1.0.2.74, WNDR3400v3 before 1.0.1.14, and WNR3500Lv2 before 1.2.0.48.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-78: Improper Neutralization of Special Elements used in an OS Command

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.

Affected products

  • Netgear D6400 Firmware: before 1.0.0.78
  • Netgear Ex6200 Firmware: before 1.0.3.86
  • Netgear Ex7000 Firmware: before 1.0.0.64
  • Netgear R6250 Firmware: before 1.0.4.8
  • Netgear R6300 Firmware: before 1.0.4.6
  • Netgear R6400 Firmware: before 1.0.1.12
  • Netgear R6700 Firmware: before 1.0.1.16
  • Netgear R7000 Firmware: before 1.0.7.10
  • Netgear R7100lg Firmware: before 1.0.0.42
  • Netgear R7300dst Firmware: before 1.0.0.44
  • Netgear R7900 Firmware: before 1.0.1.12
  • Netgear R8000 Firmware: before 1.0.3.36
  • Netgear R8300 Firmware: before 1.0.2.74
  • Netgear R8500 Firmware: before 1.0.2.74
  • Netgear Wndr3400 Firmware: before 1.0.1.14

References