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Vulnerability record · CVE-2017-16953 · published 1 December 2017

CVE-2017-16953: Zte zxdsl 831cii firmware improper authentication vulnerability

Zte · Zxdsl 831cii Firmware

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.

7.5 CVSS 3.0 High EPSS 11% · top 4.2% CWE-287 · Improper authentication
7.5CVSS 3.0 base score, v2 5.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/145121/ZTE-ZXDSL-831-Unauthorized-Configuration-Access-Bypass.html ExploitThird Party AdvisoryVDB Entry
http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1008762
https://www.exploit-db.com/exploits/43188/ Third Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/145121/ZTE-ZXDSL-831-Unauthorized-Configuration-Access-Bypass.html ExploitThird Party AdvisoryVDB Entry
http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1008762
https://www.exploit-db.com/exploits/43188/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-16953), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.