CVE-2018-3991

Name: CVE-2018-3991
Creator: NVD / NIST
Published: 2019-02-05T23:29:00.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 34.33%

Last modified Jun 17, 2026

CVE-2018-3991 is a vulnerability of currently unknown severity. 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. EPSS estimates a 34.33% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

34.33%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Wibu	Wibukey	6.40.2402.500
Siemens	Simatic Wincc Open Architecture	3.14
Siemens	Simatic Wincc Open Architecture	3.15
Siemens	Simatic Wincc Open Architecture	3.16

References

http://www.securityfocus.com/bid/107005Third Party Advisory, VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdfMitigation, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdfThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659Exploit, Third Party Advisory
http://www.securityfocus.com/bid/107005Third Party Advisory, VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdfMitigation, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdfThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659Exploit, Third Party Advisory

Timeline

Published: Feb 5, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-3991?

How severe is CVE-2018-3991?

Severity scoring for CVE-2018-3991 is pending analysis. The EPSS model estimates a 34.33% probability of exploitation in the next 30 days.

How do I fix CVE-2018-3991?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-3991?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST