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TI-2021-20053 Aliases CVE-2021-44439GHSA-89qw-2wgv-v7rj

Out-of-bounds read in Siemens JT Utilities

Priority LOW 35CWE-125Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

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 is vulnerable to an out of bounds read past the end of an allocated buffer when parsing specially crafted JT files. An attacker could leverage this vulnerability to leak information in the context of the current process. (ZDI-CAN-14908)

Why it matters now

EPSS 0.00654 51st 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-2021-44439
  2. 2026-10-03 Alias added: GHSA-89qw-2wgv-v7rj
  3. 2026-10-14 EPSS moved to the 50th–90th percentile

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