SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2017-16953

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.

EXPLOIT ✓HIGH 7.5EPSS 11.3%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 11.3%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.

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
7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
11.26% probability · 96th percentile
Public exploits
1 in Exploit-DB · verified · first 27 November 2017
CISA KEV
Not listed
Weakness
CWE-287
Affected
zte/zxdsl 831cii firmware
Source
cve@mitre.org
EPSS trend
0%8%15%21 September 2026: 8.50%22 September 2026: 11.26%27 October 2026: 11.26%21 September 202627 October 2026

EPSS moved from 8.5% on 21 September 2026 to 11.3% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-43188source ↗ZTE ZXDSL 831CII - Improper Access Restrictionshardware · Ibad Shahwebapps27 November 2017yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.