CVE-2017-18046

9.8 criticalEPSS 5.0%

Critical (9.8) in dasannetworks h640x firmware. EPSS 5.0% chance of exploitation in the next 30 days.

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).

Severity

CVSS 3.0

9.8 critical

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

EPSS: 5.0% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
CWE: CWE-119
Published: 2018-01-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

dasannetworks:h640x_firmware

References

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

Check your stack JSON