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Vulnerability record · CVE-2018-3991 · published 5 February 2019

CVE-2018-3991: Wibukey out-of-bounds write vulnerability

Wibu · Wibukey

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.

9.8 CVSS 3.0 Critical EPSS 34% · top 1.6% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/107005 Third Party AdvisoryVDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf MitigationThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659 ExploitThird Party Advisory
http://www.securityfocus.com/bid/107005 Third Party AdvisoryVDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf MitigationThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659 ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-3991), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.