CVE-2021-44439

mediumpriority · track · 31EPSS 0.007 · 51 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.65% (51st) EPSS

CVSS 6.8 · medium

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

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)

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedJT Utilitiessiemens_psirt
Update to V13.1.1.0 or later version
https://support.sw.siemens.com/
FixedJTTKsiemens_psirt
Update to V11.1.1.0 or later version
https://support.sw.siemens.com/
FixedJT Utilitiescisa_csaf_ot
Update to V13.1.1.0 or later version
https://support.sw.siemens.com/
FixedJTTKcisa_csaf_ot
Update to V11.1.1.0 or later version
https://support.sw.siemens.com/
MitigationJT Utilitiessiemens_psirt
Avoid opening untrusted files from unknown sources in JT Utilities
MitigationJTTKsiemens_psirt
Avoid opening untrusted files from unknown sources in JT Utilities
MitigationJT Utilitiescisa_csaf_ot
Avoid opening untrusted files from unknown sources in JT Utilities
MitigationJTTKcisa_csaf_ot
Avoid opening untrusted files from unknown sources in JT Utilities

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:Csecondary · CISA US

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125USCWE-125US

affected products (10)

Products and version ranges known to be affected.

JT Utilitiesall versionscisa_csaf_otUS
JTTKall versionscisa_csaf_otUS
Siemens JT Utilities< V13.1.1.0cisa_csaf_otUS
Siemens JTTK< V11.1.1.0cisa_csaf_otUS
Siemens JT UtilitiesAll versions → V13.1.1.0enisa_euvdEU
Siemens JTTKAll versions → V11.1.1.0enisa_euvdEU
siemens jt open toolkit< 11.1.1.0nvdUScpe:2.3:a:siemens:jt_open_toolkit:*:*:*:*:*:*:*:*
siemens jt utilities< 13.1.1.0nvdUScpe:2.3:a:siemens:jt_utilities:*:*:*:*:*:*:*:*
Siemens JT Utilities< V13.1.1.0siemens_psirtDE
Siemens JTTK< V11.1.1.0siemens_psirtDE

advisories (2)

Vendor and ecosystem advisories describing this.

SSA-802578SSA-802578: Multiple File Parsing Vulnerabilities in JTTK before V11.1.1.0 and JT Utilities before V13.1.1.02021-12-14csaf · siemens_psirtDE
JT Open Toolkit (JTTK) before V11.1.1.0 contains multiple vulnerabilities that could be triggered when it reads a maliciously crafted JT file. These vulnerabilities also affects JT Utilities before V13.1.1.0. If a user is tricked to open a malicious JT file with any of the affected products, this could lead the application to crash or potentially lead to arbitrary code execution. Siemens recommends to update to the latest versions and to limit opening of untrusted files from unknown sources in the affected products.
ICSA-21-350-17Siemens JT Utilities and JT Open Toolkit2021-12-14icsa · cisa_csaf_otUS
JT Open Toolkit (JTTK) before V11.1.1.0 contains multiple vulnerabilities that could be triggered when it reads a maliciously crafted JT file. These vulnerabilities also affects JT Utilities before V13.1.1.0. If a user is tricked to open a malicious JT file with any of the affected products, this could lead the application to crash or potentially lead to arbitrary code execution. Siemens recommends to update to the latest versions and to limit opening of untrusted files from unknown sources in the affected products.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd siemens_psirt NVD CVE.org MITRE

published 2021-12-14modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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