How severe is CVE-2018-1164?

CVE-2018-1164 has a CVSS 3.x base score of 9.8, 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 high, and availability high.

Is CVE-2018-1164 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1164?

CVE-2018-1164 affects Zyxel P-870h-51 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1164?

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-2018-1164 published?

CVE-2018-1164 was published on 2018-02-21 and last updated on 2026-06-17.

CVE-2018-1164

CVE-2018-1164 is a critical-severity vulnerability in Zyxel P-870h-51 Firmware with a CVSS 3.x base score of 9.8. 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-732.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Zyxel P-870h-51 Firmware
Published: 2018-02-21
Last modified: 2026-06-17

Description

This vulnerability allows remote attackers to cause a denial-of-service condition on vulnerable installations of ZyXEL P-870H-51 DSL Router 1.00(AWG.3)D5. Authentication is not required to exploit this vulnerability. The specific flaw exists within numerous exposed CGI endpoints. The vulnerability is caused by improper access controls that allow access to critical functions without authentication. An attacker can use this vulnerability to reboot affected devices, along with other actions. Was ZDI-CAN-4540.

Frequently asked questions

What is CVE-2018-1164?: This vulnerability allows remote attackers to cause a denial-of-service condition on vulnerable installations of ZyXEL P-870H-51 DSL Router 1.00(AWG.3)D5. Authentication is not required to exploit this vulnerability. The specific flaw exists within numerous exposed CGI endpoints. The vulnerability is caused by improper access controls that allow access to critical functions without authentication. An attacker can use this vulnerability to reboot affected devices, along with other actions. Was ZDI-CAN-4540.
How severe is CVE-2018-1164?: CVE-2018-1164 has a CVSS 3.x base score of 9.8, 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 high, and availability high.
Is CVE-2018-1164 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1164?: CVE-2018-1164 affects Zyxel P-870h-51 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1164?: 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-2018-1164 published?: CVE-2018-1164 was published on 2018-02-21 and last updated on 2026-06-17.

References

https://zerodayinitiative.com/advisories/ZDI-18-135

Affected products (1)

cpe:2.3:o:zyxel:p-870h-51_firmware:1.00\(awg.3\)d5:*:*:*:*:*:*:*

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