How severe is CVE-2018-6223?

CVE-2018-6223 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-2018-6223 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6223?

CVE-2018-6223 affects Trendmicro Email Encryption Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6223?

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-2018-6223 published?

CVE-2018-6223 was published on 2018-03-15 and last updated on 2026-06-17.

CVE-2018-6223

CVE-2018-6223 is a critical-severity vulnerability in Trendmicro Email Encryption Gateway with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Trendmicro Email Encryption Gateway
Published: 2018-03-15
Last modified: 2026-06-17

Description

A missing authentication for appliance registration vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow an attacker to manipulate the registration process of the product to reset configuration parameters.

Frequently asked questions

What is CVE-2018-6223?: A missing authentication for appliance registration vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow an attacker to manipulate the registration process of the product to reset configuration parameters.
How severe is CVE-2018-6223?: CVE-2018-6223 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-2018-6223 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6223?: CVE-2018-6223 affects Trendmicro Email Encryption Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6223?: 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-2018-6223 published?: CVE-2018-6223 was published on 2018-03-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trendmicro:email_encryption_gateway:5.5:*:*:*:*:*:*:*

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