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No exploitation reportedFix available

CVE-2018-3991

No exploitation reported by the sources we read.

  • Published2019-02-05
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-02-0523:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-3991?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-3991?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Siemens simatic wincc open architecture
BranchAffectedFixed in
3.14= 3.14no fix published
3.15= 3.15no fix published
3.16= 3.16no fix published
Wibu wibukeyversion to verify
BranchAffectedFixed in
6.40= 6.40.2402.500no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-19-043-03 CISA9 known affected

    WIBU SYSTEMS AG WibuKey Digital Rights Management (Update D)

    Siemens SICAM 230: All Versions 7.20 and prior · 3.16: All versions prior to vP007 · Siemens SISHIP EMCS IMAC IPMS: All versions · +6 more

Full record on NVD

Fix

  1. Vendor fix CISA ICSA-19-043-03 · 9 productsUpdated Wibu Systems Software can be found at the following link:
  2. Vendor fix CISA ICSA-19-043-03 · 9 productshttps://www.wibu.com/support/user/downloads-user-software.html
  3. Vendor fix CISA ICSA-19-043-03 · 9 productsSiemens has an updated software version for the affected SISHIP products that resolves the vulnerabilities. Users are advised to contact Siemens customer support for details.
  4. Vendor fix CISA ICSA-19-043-03 · 9 productsSiemens has released the following updates for WinCC OA that address the WibuKey vulnerabilities (login required):
  5. Vendor fix CISA ICSA-19-043-03 · 9 productsWinCC OA users can also apply the following general mitigations below to resolve the vulnerabilities.
  6. Vendor fix CISA ICSA-19-043-03 · 9 productsSiemens recommends users upgrade to WibuKey DRM Version 6.50 or newer for all affected Siemens products. Siemens also recommends mitigating CVE-2018-3991 by blocking Port 22347/TCP. For detailed information, see Siemens security advisories SSA-760124, SSA-844562, and SSA-902727 at the following lin…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.010known since 2026-10-23
  • NVDCVSS 3.09.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score34.3 %read 2026-11-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-02-05
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-3991?

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.

Is CVE-2018-3991 actively exploited?

Active exploitation of CVE-2018-3991 has not been confirmed. Its EPSS score was 34.3% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-3991?

CVE-2018-3991 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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