CVE-2021-46154

Code execution via unsafe NEU file parsing

Published Feb 9, 2022 · Updated Aug 4, 2024

Stack-based buffer overflow in Siemens Simcenter Femap 2020.2 and 2021.1 allows remote attackers to execute code via a malicious NEU file. The NEU parser performs an unchecked stack-buffer copy, accesses uninitialized memory, inadequately validates corrupting input, and can read past an allocated structure. Exploitation requires the target to visit a malicious page or open the file, and code runs with the current process's privileges.

CVSS severity7.8
High
EPSS probability1.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Siemens Simcenter Femap 2020.2 and 2021.1 allows remote attackers to execute code via a malicious NEU file. The NEU parser performs an unchecked stack-buffer copy, accesses uninitialized memory, inadequately validates corrupting input, and can read past an allocated structure. Exploitation requires the target to visit a malicious page or open the file, and code runs with the current process's privileges.

The record

CVE
CVE-2021-46154
Published
Feb 9, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
Simcenter Femap
Classifications
CWE-787, CWE-121, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE 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

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · Simcenter Femapversion=All versions

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
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS: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-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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