How severe is CVE-2019-9974?

CVE-2019-9974 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2019-9974 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9974?

CVE-2019-9974 affects Dasannetworks H660rm Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9974?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-9974 published?

CVE-2019-9974 was published on 2019-04-11 and last updated on 2026-06-17.

CVE-2019-9974

CVE-2019-9974 is a critical-severity vulnerability in Dasannetworks H660rm Firmware with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Dasannetworks H660rm Firmware
Published: 2019-04-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-9974?: CVE-2019-9974 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2019-9974 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9974?: CVE-2019-9974 affects Dasannetworks H660rm Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9974?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-9974 published?: CVE-2019-9974 was published on 2019-04-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dasannetworks:h660rm_firmware:1.03-0022:*:*:*:*:*:*:*

More vulnerabilities in Dasannetworks H660rm Firmware

CVE-2019-9976 — High (CVSS 8.8): The Boa server configuration on DASAN H660RM devices with firmware 1.03-0022 logs POST data to the /tmp/boa-temp file,…
CVE-2019-9975 — High (CVSS 7.5): DASAN H660RM devices with firmware 1.03-0022 use a hard-coded key for logs encryption. Data stored using this key can…

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