What is CVE-2017-18046?

CVE-2017-18046 is a critical-severity vulnerability in Dasannetworks H640x, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-01-21.

How severe is CVE-2017-18046?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Dasannetworks H640x

CVE-2017-18046

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).

Vulnerability class: Buffer Overflow

Published 2018-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.050 (92.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.050 · newest: 0.050 · change: 0.000

Affected products

Dasannetworks H640x
Dasannetworks H640x Firmware — versions 2.77p1-1124, 3.03p2-1146, 12.02-01121

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

twitter.com/ankit_anubhav/status/982261670394249216
blogs.securiteam.com/index.php/archives/3552 (Exploit, Third Party Advisory)
pastebin.com/Yxd9S46A

Frequently asked questions

What is CVE-2017-18046?: CVE-2017-18046 is a critical-severity vulnerability in Dasannetworks H640x, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-01-21.
How severe is CVE-2017-18046?: Critical severity. CVSS v3 base score is 9.8 out of 10.