Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 93.0%; technical severity is CVSS 9.8.
An issue was discovered on Dasan GPON home routers. It is possible to bypass authentication simply by appending "?images" to any URL of the device that requires authentication, as demonstrated by the /menu.html?images/ or /GponForm/diag_FORM?images/ URI. One can then manage the device.
Who should care
- Teams operating Gigabit Passive Optical Network (GPON) Routers, Gpon Router Firmware
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Gigabit Passive Optical Network (GPON) Routers, Gpon Router Firmware is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- The impacted product is end-of-life and should be disconnected if still in use.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-287
- Affected versions
- Dasan Gigabit Passive Optical Network (GPON) Routers; Dasannetworks Gpon Router Firmware (Version: -)
- Published
- 4 May 2018
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 93.0%
- Signal calculated at 84