How severe is CVE-2021-44432?

CVE-2021-44432 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44432 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44432?

CVE-2021-44432 primarily affects Siemens Jt Open Toolkit. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44432?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-44432 published?

CVE-2021-44432 was published on 2021-12-14 and last updated on 2026-06-17.

CVE-2021-44432

CVE-2021-44432 is a high-severity vulnerability in Siemens Jt Open Toolkit with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-121
Affected product: Siemens Jt Open Toolkit
Published: 2021-12-14
Last modified: 2026-06-17

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 stack based buffer overflow while parsing specially crafted JT files. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-14845)

Frequently asked questions

What is CVE-2021-44432?: 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 stack based buffer overflow while parsing specially crafted JT files. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-14845)
How severe is CVE-2021-44432?: CVE-2021-44432 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44432 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44432?: CVE-2021-44432 primarily affects Siemens Jt Open Toolkit. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-44432?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-44432 published?: CVE-2021-44432 was published on 2021-12-14 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:siemens:jt_open_toolkit:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:jt_utilities:*:*:*:*:*:*:*:*

More vulnerabilities in Siemens Jt Open Toolkit

CVE-2023-30796 — High (CVSS 7.8): A vulnerability has been identified in JT Open (All versions < V11.4), JT Utilities (All versions < V13.4). The…
CVE-2023-29053 — High (CVSS 7.8): A vulnerability has been identified in JT Open (All versions < V11.3.2.0), JT Utilities (All versions < V13.3.0.0). The…
CVE-2022-47977 — High (CVSS 7.8): A vulnerability has been identified in JT Open (All versions < V11.2.3.0), JT Utilities (All versions < V13.2.3.0). The…
CVE-2022-47936 — High (CVSS 7.8): A vulnerability has been identified in JT Open (All versions < V11.2.3.0), JT Utilities (All versions < V13.2.3.0),…
CVE-2022-47935 — High (CVSS 7.8): A vulnerability has been identified in JT Open (All versions < V11.1.1.0), JT Utilities (All versions < V13.1.1.0),…
CVE-2022-41851 — High (CVSS 7.8): A vulnerability has been identified in JTTK (All versions < V11.1.1.0), Simcenter Femap V2022.1 (All versions <…

All CVEs affecting Siemens Jt Open Toolkit →

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

CVE-2026-12848 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12847 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12846 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12485 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-37541 — Critical (CVSS 10.0): Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_gvret.cpp, the length…
CVE-2026-42996 — Critical (CVSS 10.0): JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a radio transmission of…

Browse all CWE-121 (Stack-based Buffer Overflow) vulnerabilities →