CVE-2018-4012
CVE-2018-4012 is a critical-severity vulnerability in Webroot Brightcloud with a CVSS 3.x base score of 9.0. 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-119.
Key facts
- Severity: Critical (CVSS 3.x base score 9.0)
- CVSS v2: 9.3
- EPSS exploit prediction: 3% (83rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Webroot Brightcloud
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2018-4012?
- 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.
- How severe is CVE-2018-4012?
- CVE-2018-4012 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-4012 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-4012?
- CVE-2018-4012 affects Webroot Brightcloud. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-4012?
- 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-2018-4012 published?
- CVE-2018-4012 was published on 2019-01-03 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:webroot:brightcloud:*:*:*:*:*:*:*:*
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