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Fencer Vulns
critical 10.0

CVE-2018-3991 in the critical feed json

An exploitable heap overflow vulnerability exists in the WkbProgramLow function of WibuKey Network server management, version 6.40.2402.500.

published 2019-02-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-15777

cvss
10.0
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
34.3%
EPSS 34.3% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-19-043-03 updated cvss 10.0

WIBU SYSTEMS AG WibuKey Digital Rights Management (Update D)

  • WIBU-SYSTEMS AG COPA-DATA straton workbench <= 9.2 WIBU-SYSTEMS AG COPA-DATA zenon products <= 7.20 (7.50 and 7.60 may also be affected if WibuKey was installed manually) WIBU-SYSTEMS AG Phoenix Contact MEVIEW3 <= 3.14.25, 3.15.18 WIBU-SYSTEMS AG Siemens SICAM 230 <= 7.20 WIBU-SYSTEMS AG Siemens SIMATIC WinCC OA 3.14 < P025 WIBU-SYSTEMS AG Siemens SIMATIC WinCC OA 3.15 < P018
    +3 more products
    WIBU-SYSTEMS AG Siemens SIMATIC WinCC OA 3.16 < P007 WIBU-SYSTEMS AG Siemens SISHIP EMCS IMAC IPMS WIBU-SYSTEMS AG Sprecher Automation SPRECON-V460 products <= 7.20 (7.50 and 7.60 may also be affected if WibuKey was installed manually)
    affected: fixed in 6.50a winccoa.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

34.33% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 10.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.