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CVE-2018-21153: Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker.

CVE-2018-21153 is rated critical with a CVSS v3.1 base score of 9.8 and NVD lists 20 affected products, including Netgear D7800 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 a buffer overflow by an unauthenticated attacker. This affects D7800 before 1.0.1.34, DM200 before 1.0.0.50, EX2700 before 1.0.1.32, EX6100v2 before 1.0.1.70, EX6150v2 before 1.0.1.70, EX6200v2 before 1.0.1.62, EX6400 before 1.0.1.78, EX7300 before 1.0.1.62, EX8000 before 1.0.0.114, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7500v2 before 1.0.3.26, R7800 before 1.0.2.40, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WN2000RPTv3 before 1.0.1.26, WN3000RPv2 before 1.0.0.56, WN3000RPv3 before 1.0.2.66, WN3100RPv2 before 1.0.0.56, 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.

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-120: Buffer Copy without Checking Size of Input

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Affected products

  • Netgear D7800 Firmware: before 1.0.1.34
  • Netgear Dm200 Firmware: before 1.0.0.50
  • Netgear Ex2700 Firmware: before 1.0.1.32
  • Netgear Ex6100 Firmware: before 1.0.1.70
  • Netgear Ex6150 Firmware: before 1.0.1.70
  • Netgear Ex6200 Firmware: before 1.0.1.62
  • Netgear Ex6400 Firmware: before 1.0.1.78
  • Netgear Ex7300 Firmware: before 1.0.1.62
  • Netgear Ex8000 Firmware: before 1.0.0.114
  • Netgear R6100 Firmware: before 1.0.1.22
  • Netgear R7500 Firmware: before 1.0.0.122; before 1.0.3.26
  • Netgear R7800 Firmware: before 1.0.2.40
  • Netgear R8900 Firmware: before 1.0.3.10
  • Netgear R9000 Firmware: before 1.0.3.10
  • Netgear Wn2000rpt Firmware: before 1.0.1.26

References