CVE-2018-10562

CVE-2018-10562 is an OS command injection flaw (CWE-78) in the web management interface of Dasan GPON home routers. When chained with the companion authentication bypass CVE-2018-10561, a remote, unauthenticated attacker can send crafted requests that execute arbitrary commands on the device. Successful exploitation yields full control of the router, enabling device takeover, botnet enrollment, and, per CISA, use in ransomware operations. Anyone operating an affected Dasan GPON router — many of which were deployed by internet service providers — is affected, and CISA notes the impacted products are end-of-life. Exploitation is confirmed in the wild: the flaw is in CISA's KEV (added 2022-03-31) with known ransomware use and a 100% EPSS probability of exploitation within 30 days.

What to do: Because the product line is end-of-life and CISA's required action is to disconnect impacted devices if still in use, retire or replace affected routers rather than patching in place. If replacement must wait, block or firewall the web management interface from the internet, check the device for signs of compromise, and ensure the related authentication-bypass path CVE-2018-10561 is also closed.