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TI-2021-20059 Aliases CVE-2021-44445GHSA-wp8c-5j7q-j666

Heap-based buffer overflow in Siemens JT Utilities

Priority LOW 36CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

A vulnerability has been identified in JT Utilities (All versions < V13.1.1.0), JTTK (All versions < V11.1.1.0). JTTK library in affected products contains an out of bounds write past the fixed-length heap-based buffer while parsing specially crafted JT files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-15054)

Why it matters now

EPSS 0.0084 58th percentileScored 2026-11-07
Fix Fixed JT Utilities (Siemens): V13.1.1.0JTTK (Siemens): V11.1.1.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensJT Utilitiesbefore V13.1.1.0V13.1.1.0Patch availableCNA
SiemensJTTKbefore V11.1.1.0V11.1.1.0Patch availableCNA
  • JT Utilities VendorSiemens Affected before V13.1.1.0 Fixed in V13.1.1.0 Patch available CNA
  • JTTK VendorSiemens Affected before V11.1.1.0 Fixed in V11.1.1.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:siemens:jt_open_toolkit:*:*:*:*:*:*:*:*before 11.1.1.0VulnerableSiemens
cpe:2.3:a:siemens:jt_utilities:*:*:*:*:*:*:*:*before 13.1.1.0VulnerableSiemens
  • cpe:2.3:a:siemens:jt_open_toolkit:*:*:*:*:*:*:*:* Versions before 11.1.1.0 Vulnerable ·Siemens
  • cpe:2.3:a:siemens:jt_utilities:*:*:*:*:*:*:*:* Versions before 13.1.1.0 Vulnerable ·Siemens

Remediation

  • Fix · CNA JT Utilities (Siemens) Fixed in V13.1.1.0
  • Fix · CNA JTTK (Siemens) Fixed in V11.1.1.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-44445
  2. 2026-10-03 Alias added: GHSA-wp8c-5j7q-j666

References

Advisory 1

  • TI-2021-19766 Use after free in Siemens JT Open CVSS 3.1HIGH 7.8
  • TI-2021-19754 Out-of-bounds write in Siemens JT Open CVSS 3.1HIGH 7.8
  • TI-2022-23749 Memory corruption in Siemens JT Open CVSS 3.1HIGH 7.8
  • TI-2022-20204 A vulnerability has been identified in JTTK (All versions < V11.1.1.0), Simcenter Femap… CVSS 3.1HIGH 7.8
  • TI-2021-20063 Out-of-bounds write in Siemens JT Utilities CVSS 3.1HIGH 7.8
  • TI-2021-20061 Use after free in Siemens JT Utilities CVSS 3.1HIGH 7.8
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences