CVE-2020-27001

Remote code execution via PAR stack buffer overflow

Published Feb 9, 2021 · Updated Aug 4, 2024

Stack overflow in Siemens JT2Go and Teamcenter Visualization before V13.1.0.2 allows remote attackers to execute code via crafted PAR files. The PAR parser copies attacker-controlled length data into a fixed-size stack buffer without validation, overwriting stack memory. Exploitation requires a user to open the malicious file, after which code runs in the current process context; no network-only trigger is documented.

CVSS severity7.8
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Siemens JT2Go and Teamcenter Visualization before V13.1.0.2 allows remote attackers to execute code via crafted PAR files. The PAR parser copies attacker-controlled length data into a fixed-size stack buffer without validation, overwriting stack memory. Exploitation requires a user to open the malicious file, after which code runs in the current process context; no network-only trigger is documented.

The record

CVE
CVE-2020-27001
Published
Feb 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Teamcenter Visualization
Classifications
CWE-121, CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 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 < V13.1.0.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · Teamcenter Visualizationversion=All versions < V13.1.0.2
Siemens · JT2Goversion=All versions < V13.1.0.2

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8Zero Day InitiativeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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