CVE-2024-49849

Arbitrary code execution via crafted log file

Published Dec 10, 2024 · Updated Dec 9, 2025

Deserialization in Siemens engineering applications allows local users to execute arbitrary code by opening a crafted log file. Their log-file parser fails to sanitize user-controlled serialized input before interpreting it, allowing type confusion during parsing. A user must open an untrusted file in an affected application, and resulting code executes in that application's security context.

CVSS severity8.4
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Siemens engineering applications allows local users to execute arbitrary code by opening a crafted log file. Their log-file parser fails to sanitize user-controlled serialized input before interpreting it, allowing type confusion during parsing. A user must open an untrusted file in an affected application, and resulting code executes in that application's security context.

The record

CVE
CVE-2024-49849
Published
Dec 10, 2024
Updated
Dec 9, 2025
Vendor
Siemens
Product
SIMATIC STEP 7
Classifications
CWE-502, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 2025Record 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=0 <*
  2. Affected versionversion=0 <V17 Update 9
  3. Affected versionversion=0 <V19 Update 4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC STEP 7version=0 <*; version=0 <V17 Update 9; version=0 <V19 Update 4
Siemens · SIMATIC WinCCversion=0 <*; version=0 <V17 Update 9; version=0 <V19 Update 4
Siemens · SIRIUS Safety ES (TIA Portal)version=0 <*
Siemens · TIA Portal Cloudversion=0 <*; version=0 <V5.2.1.1
Siemens · SIMOCODE ESversion=0 <*
Siemens · SIMATIC STEP 7 Safetyversion=0 <*; version=0 <V17 Update 9; version=0 <V19 Update 4
Siemens · SIMATIC WinCC Unifiedversion=0 <*; version=0 <V17 Update 9; version=0 <V19 Update 4
Siemens · SIMATIC S7-PLCSIMversion=0 <*
Siemens · SIMOTION SCOUT TIAversion=0 <*; version=0 <V5.6 SP1 HF7
Siemens · SINAMICS Startdriveversion=0 <*
Siemens · SIRIUS Soft Starter ES (TIA Portal)version=0 <*

Published CVSS scores

7.8Siemens AGCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.4Siemens AGCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious 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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