CVE-2018-21123

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-22 · updated 2026-06-17
Weakness: CWE-74

Description

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects WC7500 before 6.5.3.9, WC7520 before 6.5.3.9, WC7600v1 before 6.5.3.9, and WC7600v2 before 6.5.3.9.

Affected products

NETGEAR Wc7500 Firmware: before 6.5.3.9 — fixed in 6.5.3.9
NETGEAR Wc7520 Firmware: before 6.5.3.9 — fixed in 6.5.3.9
NETGEAR Wc7600 Firmware: before 6.5.3.9 — fixed in 6.5.3.9

How to fix

Upgrade to a fixed version: NETGEAR Wc7500 Firmware 6.5.3.9; NETGEAR Wc7520 Firmware 6.5.3.9; NETGEAR Wc7600 Firmware 6.5.3.9. Check the vendor advisory for mitigations.

References

https://kb.netgear.com/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230
https://kb.netgear.com/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230

Get alerted when CVE-2018-21123 or the next vulnerability affects your stack