CVE-2018-21200

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-28 · updated 2026-06-17
Weakness: CWE-787

Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R7800 before 1.0.2.40 and R9000 before 1.0.3.6.

Affected products

NETGEAR R7800 Firmware: before 1.0.2.40 — fixed in 1.0.2.40
NETGEAR R9000 Firmware: before 1.0.3.6 — fixed in 1.0.3.6

How to fix

Upgrade to a fixed version: NETGEAR R7800 Firmware 1.0.2.40; NETGEAR R9000 Firmware 1.0.3.6. Check the vendor advisory for mitigations.

References

https://kb.netgear.com/000055149/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-PSV-2017-2592
https://kb.netgear.com/000055149/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-PSV-2017-2592

Get alerted when CVE-2018-21200 or the next vulnerability affects your stack