CVE-2017-16953: ZTE Zxdsl 831cii Firmware

High severity, CVSS 7.5. EPSS: 11.3% chance of exploitation in the next 30 days.

connoppp.cgi on ZTE ZXDSL 831CII devices does not require HTTP Basic Authentication, which allows remote attackers to modify the PPPoE configuration or set up a malicious configuration via a GET request.

Affected products

• ZTE Zxdsl 831cii Firmware: affected versions not specified

Published 2017-12-01. Last modified 2026-06-17.