CVE-2018-12542

highpriority · attend · 50EPSS 0.022 · 83 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

2.22% (83rd) EPSS

CVSS 7.5 · high

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.09.3criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimaryCWE-22US

exploits (1)

Public proof-of-concept and weaponised exploit code.

shoucheng3/vert-x3__vertx-web_CVE-2018-12542_3-5-3-CR1shoucheng3/vert-x3__vertx-web_CVE-2018-12542_3-5-3-CR1PoC · poc_in_github

affected products (4)

Products and version ranges known to be affected.

The Eclipse Foundation Eclipse Vert.x≤ unspecified ≤3.5.3enisa_euvdEU
The Eclipse Foundation Eclipse Vert.x3.0 → unspecifiedenisa_euvdEU
eclipse vert.x3.0.0 → 3.5.3nvdUScpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*
Maven io.vertx:vertx-web3.0.0 → 3.5.4osvUSpkg:maven/io.vertx/vertx-web

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-h39x-m55c-v55hEclipse Vert.x does not properly neutralize '' (forward slashes) sequences that can resolve to an external location2018-10-17ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-10-10modified 2026-06-17

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+12524 more

references (9)

External citations — patches, advisories, analysis.

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