CVE-2021-44436

Process-memory disclosure via out-of-bounds JT parsing

Published Dec 14, 2021 · Updated Aug 4, 2024

Out-of-bounds read in Siemens JT Utilities before 13.1.1.0 and JT Open Toolkit before 11.1.1.0 allows attackers to disclose process memory. The JTTK library's JT-file parser reads past the end of an allocated buffer while decoding a specially crafted file, exposing adjacent data from the current process. Attackers must convince a user to open the file with an affected product; no integrity or availability impact is reported.

CVSS severity7.8
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Siemens JT Utilities before 13.1.1.0 and JT Open Toolkit before 11.1.1.0 allows attackers to disclose process memory. The JTTK library's JT-file parser reads past the end of an allocated buffer while decoding a specially crafted file, exposing adjacent data from the current process. Attackers must convince a user to open the file with an affected product; no integrity or availability impact is reported.

The record

CVE
CVE-2021-44436
Published
Dec 14, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
JT Utilities
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V13.1.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · JT Utilitiesversion=All versions < V13.1.1.0
Siemens · JT Open Toolkitversion=All versions < V11.1.1.0

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
7.8Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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