CVE-2019-12512: Stored XSS via X-Forwarded-For Header During Incorrect Login

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-02-24 · updated 2026-06-17
Weakness: CWE-79

Description

In NETGEAR Nighthawk X10-R900 prior to 1.0.4.24, an attacker may execute stored XSS attacks against this device by supplying a malicious X-Forwarded-For header while performing an incorrect login attempt. The value supplied by this header will be inserted into administrative logs, found at Advanced settings->Administration->Logs, and may trigger when the page is viewed. Although this value is inserted into a textarea tag, the attack simply needs to supply a closing textarea tag.

Affected products

NETGEAR Nighthawk X10-R9000 Firmware: before 1.0.4.24 — fixed in 1.0.4.24

How to fix

Upgrade to a fixed version: NETGEAR Nighthawk X10-R9000 Firmware 1.0.4.24. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2019-12512 or the next vulnerability affects your stack