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CVE-2018-12537

19
FAUCET Score

CVE-2018-12537 affects Eclipse Vert.x versions 3.0 through 3.5.1, stemming from a lack of filtering for carriage return and line feed characters in HTTP header values. This flaw allows attackers to inject new headers into client requests or server responses. Rated as Medium severity (CVSS 5.3), it presents a low-complexity network attack with potential for integrity impact, though no confidentiality or availability impact. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.0, <= 3.5.1CPE matchmatch criteria
cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.48%
Probability of exploitation in next 30 days
EPSS Percentile
82.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0248 is in the 74th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: io.vertx:vertx-coreFixed in: 3.5.2
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.2Fixed in: vertx
View patch
redhatpatch availablevia redhat_api
Product: Text-Only RHOARFixed in: vertx
View patch

Vendor Advisories (2)

mavenGHSA-6cw8-7j6c-hccpmedium

Moderate severity vulnerability that affects io.vertx:vertx-core

Oct 19, 2018
redhatCVE-2018-12537Moderate

vertx: Improper neutralization of CRLF sequences allows remote attackers to inject arbitrary HTTP response headers

Jun 13, 2018

References

access.redhat.com / errata/RHSA-2018:2371
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3768
Third Party Advisory
bugs.eclipse.org / bugs/show_bug.cgi
Issue TrackingThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / eclipse/vert.x/commit/1bb6445226c39a95e7d07ce3caaf56828e8aab72
Third Party Advisory
github.com / eclipse/vert.x/issues/2470
Third Party Advisory
compass-security.com / fileadmin/Datein/Research/Advisories/CSNC-2018-021_vertx.txt
Third Party Advisory