What is CVE-2019-9974?

CVE-2019-9974 is a critical-severity vulnerability in Dasannetworks H660rm, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2019-04-11.

How severe is CVE-2019-9974?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Dasannetworks H660rm

CVE-2019-9974

diag_tool.cgi on DASAN H660RM GPON routers with firmware 1.03-0022 lacks any authorization check, which allows remote attackers to run a ping command via a GET request to enumerate LAN devices or crash the router with a DoS attack.

Vulnerability class: Broken Authentication

Published 2019-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Dasannetworks H660rm
Dasannetworks H660rm Firmware — versions 1.03-0022

Weakness classification (CWE)

References

seclists.org/bugtraq/2019/Mar/41 (mailing-list, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/152232/DASAN-H660RM-Information-Disclosure-Hardco… (VDB Entry, Third Party Advisory)
blog.burghardt.pl/2019/03/diag_tool-cgi-on-dasan-h660rm-devices-with-firmware-1… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9974?: CVE-2019-9974 is a critical-severity vulnerability in Dasannetworks H660rm, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2019-04-11.
How severe is CVE-2019-9974?: Critical severity. CVSS v3 base score is 9.1 out of 10.