How severe is CVE-2018-12542?

CVE-2018-12542 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-2018-12542 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-12542?

CVE-2018-12542 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-12542?

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-2018-12542 published?

CVE-2018-12542 was published on 2018-10-10 and last updated on 2026-06-17.

CVE-2018-12542

CVE-2018-12542 is a critical-severity vulnerability in Eclipse Vert.x 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Eclipse Vert.x
Published: 2018-10-10
Last modified: 2026-06-17

Description

In version from 3.0.0 to 3.5.3 of Eclipse Vert.x, the StaticHandler uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\' (forward slashes) sequences that can resolve to a location that is outside of that directory when running on Windows Operating Systems.

Frequently asked questions

What is CVE-2018-12542?: In version from 3.0.0 to 3.5.3 of Eclipse Vert.x, the StaticHandler uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\' (forward slashes) sequences that can resolve to a location that is outside of that directory when running on Windows Operating Systems.
How severe is CVE-2018-12542?: CVE-2018-12542 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-2018-12542 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-12542?: CVE-2018-12542 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-12542?: 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-2018-12542 published?: CVE-2018-12542 was published on 2018-10-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*

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