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Vulnerability record · CVE-2017-18046 · published 21 January 2018

CVE-2017-18046: Dasannetworks h640x firmware memory buffer overflow vulnerability

Dasannetworks · H640x Firmware

Buffer overflow on Dasan GPON ONT WiFi Router H640X 12.02-01121 2.77p1-1124 and 3.03p2-1146 devices allows remote attackers to execute arbitrary code via a long POST request to the login_action function in /cgi-bin/login_action.cgi (aka cgipage.cgi).

9.8 CVSS 3.0 Critical EPSS 5.0% · top 8.0% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
5.0%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

Buffer overflow on Dasan GPON ONT WiFi Router H640X 12.02-01121 2.77p1-1124 and 3.03p2-1146 devices allows remote attackers to execute arbitrary code via a long POST request to the login_action function in /cgi-bin/login_action.cgi (aka cgipage.cgi).

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

Affected products

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

References

LinkTags
https://blogs.securiteam.com/index.php/archives/3552 ExploitThird Party Advisory
https://pastebin.com/Yxd9S46A
https://twitter.com/ankit_anubhav/status/982261670394249216
https://blogs.securiteam.com/index.php/archives/3552 ExploitThird Party Advisory
https://pastebin.com/Yxd9S46A
https://twitter.com/ankit_anubhav/status/982261670394249216

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Source: NIST National Vulnerability Database (record CVE-2017-18046), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.