THREATPORT/VULNERABILITY/CVE-2018-3991
CRITICAL SEVERITY

CVE-2018-3991

Wibukey vulnerability

CVSS
10.0
EPSS
34.3%
EPSS pct
98th
Exploited
No known
An exploitable heap overflow vulnerability exists in the WkbProgramLow function of WibuKey Network server management, version 6.40.2402.500. A specially crafted TCP packet can cause a heap overflow, potentially leading to remote code execution. An attacker can send a malformed TCP packet to trigger this vulnerability.
Affected vendor
Wibu
Affected product
Wibukey
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2019-02-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 34.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2018-3991

  • Confirm whether Wibu Wibukey is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2018-3991.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-3991

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-3991 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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