How severe is CVE-2018-12537?

CVE-2018-12537 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2018-12537 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-12537?

CVE-2018-12537 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-12537?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-12537 published?

CVE-2018-12537 was published on 2018-08-14 and last updated on 2026-06-17.

CVE-2018-12537

CVE-2018-12537 is a medium-severity vulnerability in Eclipse Vert.x with a CVSS 3.x base score of 5.3. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Eclipse Vert.x
Published: 2018-08-14
Last modified: 2026-06-17

Description

In Eclipse Vert.x version 3.0 to 3.5.1, the HttpServer response headers and HttpClient request headers do not filter carriage return and line feed characters from the header value. This allow unfiltered values to inject a new header in the client request or server response.

Frequently asked questions

What is CVE-2018-12537?: In Eclipse Vert.x version 3.0 to 3.5.1, the HttpServer response headers and HttpClient request headers do not filter carriage return and line feed characters from the header value. This allow unfiltered values to inject a new header in the client request or server response.
How severe is CVE-2018-12537?: CVE-2018-12537 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2018-12537 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-12537?: CVE-2018-12537 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-12537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-12537 published?: CVE-2018-12537 was published on 2018-08-14 and last updated on 2026-06-17.

References

Affected products (1)

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

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