How severe is CVE-2018-18331?

CVE-2018-18331 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-18331 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18331?

CVE-2018-18331 affects Trendmicro Officescan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-18331?

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

When was CVE-2018-18331 published?

CVE-2018-18331 was published on 2018-12-21 and last updated on 2026-06-17.

CVE-2018-18331

CVE-2018-18331 is a high-severity vulnerability in Trendmicro Officescan with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Trendmicro Officescan
Published: 2018-12-21
Last modified: 2026-06-17

Description

A Trend Micro OfficeScan XG weak file permissions vulnerability on a particular folder for a particular group may allow an attacker to alter the files, which could lead to other exploits on vulnerable installations.

Frequently asked questions

What is CVE-2018-18331?: A Trend Micro OfficeScan XG weak file permissions vulnerability on a particular folder for a particular group may allow an attacker to alter the files, which could lead to other exploits on vulnerable installations.
How severe is CVE-2018-18331?: CVE-2018-18331 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-18331 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18331?: CVE-2018-18331 affects Trendmicro Officescan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-18331?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-18331 published?: CVE-2018-18331 was published on 2018-12-21 and last updated on 2026-06-17.

References

https://success.trendmicro.com/solution/1121674

Affected products (1)

cpe:2.3:a:trendmicro:officescan:xg:*:*:*:*:*:*:*

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