Zero-day vulnerability in DrayTek firmware

Cross-site request forgery

Vulnerability exploitation was spotted by users of DrayTek routers. Attackers used CSRF vulnerability to change DNS settings of multiple routers to address:

Vulnerability details

Advisory: SB2018051901 - CSRF in multiple DrayTek routers

Vulnerable component: DrayTek firmware


CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)


The vulnerability allows a remote attacker to perform CSRF attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin in DrayTek Vigor web management interface. A remote attacker can change setting of Vigor router.

Note: this vulnerability has been exploited in the wild in May 2018. The attackers changed DNS servers of victims to address: