How severe is CVE-2018-9285?

CVE-2018-9285 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-2018-9285 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9285?

CVE-2018-9285 primarily affects Asus Rt-ac66u Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-9285?

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-2018-9285 published?

CVE-2018-9285 was published on 2018-04-04 and last updated on 2026-06-17.

CVE-2018-9285

CVE-2018-9285 is a critical-severity vulnerability in Asus Rt-ac66u 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Asus Rt-ac66u Firmware
Published: 2018-04-04
Last modified: 2026-06-17

Description

Main_Analysis_Content.asp in /apply.cgi on ASUS RT-AC66U, RT-AC68U, RT-AC86U, RT-AC88U, RT-AC1900, RT-AC2900, and RT-AC3100 devices before 3.0.0.4.384_10007; RT-N18U devices before 3.0.0.4.382.39935; RT-AC87U and RT-AC3200 devices before 3.0.0.4.382.50010; and RT-AC5300 devices before 3.0.0.4.384.20287 allows OS command injection via the pingCNT and destIP fields of the SystemCmd variable.

Frequently asked questions

What is CVE-2018-9285?: Main_Analysis_Content.asp in /apply.cgi on ASUS RT-AC66U, RT-AC68U, RT-AC86U, RT-AC88U, RT-AC1900, RT-AC2900, and RT-AC3100 devices before 3.0.0.4.384_10007; RT-N18U devices before 3.0.0.4.382.39935; RT-AC87U and RT-AC3200 devices before 3.0.0.4.382.50010; and RT-AC5300 devices before 3.0.0.4.384.20287 allows OS command injection via the pingCNT and destIP fields of the SystemCmd variable.
How severe is CVE-2018-9285?: CVE-2018-9285 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-2018-9285 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9285?: CVE-2018-9285 primarily affects Asus Rt-ac66u Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-9285?: 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-2018-9285 published?: CVE-2018-9285 was published on 2018-04-04 and last updated on 2026-06-17.

References

Affected products (11)

cpe:2.3:o:asus:rt-ac66u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac68u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac86u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac88u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac1900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac2900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac3100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-n18u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac87u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac3200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:rt-ac5300_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Asus Rt-ac66u Firmware

CVE-2013-6343 — Critical (CVSS 10.0): Multiple buffer overflows in web.c in httpd on the ASUS RT-N56U and RT-AC66U routers with firmware 3.0.0.4.374_979…
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CVE-2018-8879 — Critical (CVSS 9.8): Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before…
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CVE-2013-4659 — Critical (CVSS 9.8): Buffer overflow in Broadcom ACSD allows remote attackers to execute arbitrary code via a long string to TCP port 5916.…

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