HIGH

CVE-2018-4012

CVSS v3

8.1

HIGH

EPSS Score

2.5 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2018-4012 yet.

Full record on NVD

Description

An exploitable buffer overflow vulnerability exists in the HTTP header-parsing function of the Webroot BrightCloud SDK. The function bc_http_read_header incorrectly handles overlong headers, leading to arbitrary code execution. An unauthenticated attacker could impersonate a remote BrightCloud server to trigger this vulnerability.

Technical details

Published: 2019-01-03

Frequently asked questions

What is CVE-2018-4012?

Is CVE-2018-4012 actively exploited?

Active exploitation of CVE-2018-4012 has not been confirmed. Its EPSS score was 2.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-4012?

CVE-2018-4012 has a CVSS v3 base score of 8.1 (HIGH severity).

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