How severe is CVE-2018-9866?

CVE-2018-9866 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-2018-9866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9866?

CVE-2018-9866 affects Sonicwall Global Management System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9866?

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-2018-9866 published?

CVE-2018-9866 was published on 2018-08-03 and last updated on 2026-06-17.

CVE-2018-9866

CVE-2018-9866 is a critical-severity vulnerability in Sonicwall Global Management System 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Sonicwall Global Management System
Published: 2018-08-03
Last modified: 2026-06-17

Description

A vulnerability in lack of validation of user-supplied parameters pass to XML-RPC calls on SonicWall Global Management System (GMS) virtual appliance's, allow remote user to execute arbitrary code. This vulnerability affected GMS version 8.1 and earlier.

Frequently asked questions

What is CVE-2018-9866?: A vulnerability in lack of validation of user-supplied parameters pass to XML-RPC calls on SonicWall Global Management System (GMS) virtual appliance's, allow remote user to execute arbitrary code. This vulnerability affected GMS version 8.1 and earlier.
How severe is CVE-2018-9866?: CVE-2018-9866 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-2018-9866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9866?: CVE-2018-9866 affects Sonicwall Global Management System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9866?: 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-2018-9866 published?: CVE-2018-9866 was published on 2018-08-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sonicwall:global_management_system:*:*:*:*:*:*:*:*

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