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Vulnerability record · CVE-2021-44434 · published 14 December 2021

CVE-2021-44434: Siemens jt open toolkit out-of-bounds write vulnerability

Siemens · Jt Open Toolkit

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 write past the end of an allocated structure while parsing specially crafted JT files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-14902, ZDI-CAN-14866)

7.8 CVSS 3.1 High EPSS 0.81% · top 44.5% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.8
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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 write past the end of an allocated structure while parsing specially crafted JT files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-14902, ZDI-CAN-14866)

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-802578.pdf Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-802578.pdf Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-44434), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.