A vulnerability has been identified in SIMATIC S7-PLCSIM V16 (All versions), SIMATIC S7-PLCSIM V17 (All versions), SIMATIC STEP 7 Safety V1…

published 2024-12-10 22 mo ago modified 2026-10-13 27 d ago also EUVD-2024-43834

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

A vulnerability has been identified in SIMATIC S7-PLCSIM V16 (All versions), SIMATIC S7-PLCSIM V17 (All versions), SIMATIC STEP 7 Safety V16 (All versions), SIMATIC STEP 7 Safety V17 (All versions < V17 Update 9), SIMATIC STEP 7 Safety V18 (All versions < V18 Update 6), SIMATIC STEP 7 Safety V19 (All versions < V19 Update 4), SIMATIC STEP 7 V16 (All versions), SIMATIC STEP 7 V17 (All versions < V17 Update 9), SIMATIC STEP 7 V18 (All versions < V18 Update 6), SIMATIC STEP 7 V19 (All versions < V19 Update 4), SIMATIC WinCC Unified V16 (All versions), SIMATIC WinCC Unified V17 (All versions < V17 Update 9), SIMATIC WinCC Unified V18 (All versions < V18 Update 6), SIMATIC WinCC Unified V19 (All versions < V19 Update 4), SIMATIC WinCC V16 (All versions), SIMATIC WinCC V17 (All versions < V17 Update 9), SIMATIC WinCC V18 (All versions < V18 Update 6), SIMATIC WinCC V19 (All versions < V19 Update 4), SIMOCODE ES V16 (All versions), SIMOCODE ES V17 (All versions), SIMOCODE ES V18 (All versions), SIMOCODE ES V19 (All versions), SIMOTION SCOUT TIA V5.4 (All versions), SIMOTION SCOUT TIA V5.5 (All versions), SIMOTION SCOUT TIA V5.6 (All versions < V5.6 SP1 HF7), SINAMICS Startdrive V16 (All versions), SINAMICS Startdrive V17 (All versions), SINAMICS Startdrive V18 (All versions), SINAMICS Startdrive V19 (All versions), SIRIUS Safety ES V17 (TIA Portal) (All versions), SIRIUS Safety ES V18 (TIA Portal) (All versions < V18 Update 6), SIRIUS Safety ES V19 (TIA Portal) (All versions), SIRIUS Soft Starter ES V17 (TIA Portal) (All versions), SIRIUS Soft Starter ES V18 (TIA Portal) (All versions), SIRIUS Soft Starter ES V19 (TIA Portal) (All versions), TIA Portal Cloud V16 (All versions), TIA Portal Cloud V17 (All versions), TIA Portal Cloud V18 (All versions < V6.3.0.2), TIA Portal Cloud V19 (All versions < V5.2.1.1). Affected products do not properly sanitize user-controllable input when parsing log files. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application.

Patch / fix

fixed in 16

Siemens SIMATIC STEP 7 Safety V17 V17 Update 9
Siemens SIMATIC STEP 7 Safety V18 V18 Update 6
Siemens SIMATIC STEP 7 Safety V19 V19 Update 4
Siemens SIMATIC STEP 7 V17 V17 Update 9
Siemens SIMATIC STEP 7 V18 V18 Update 6
Siemens SIMATIC STEP 7 V19 V19 Update 4
Siemens SIMATIC WinCC Unified V17 V17 Update 9
Siemens SIMATIC WinCC Unified V18 V18 Update 6
Siemens SIMATIC WinCC Unified V19 V19 Update 4
Siemens SIMATIC WinCC V17 V17 Update 9
Siemens SIMATIC WinCC V18 V18 Update 6
Siemens SIMATIC WinCC V19 V19 Update 4
Siemens SIMOTION SCOUT TIA V5.6 V5.6 SP1 HF7
Siemens SIRIUS Safety ES V18 (TIA Portal) V18 Update 6
Siemens TIA Portal Cloud V18 V6.3.0.2
Siemens TIA Portal Cloud V19 V5.2.1.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-347-05 updated 2025-08-12 cvss 7.8

Siemens Siemens Engineering Platforms

Siemens SIMATIC S7-PLCSIM V16 Siemens SIMATIC S7-PLCSIM V17 Siemens SIMATIC STEP 7 Safety V16
affected: mitigation, no fix planned
Siemens SIMATIC STEP 7 Safety V17 Siemens SIMATIC STEP 7 Safety V18
affected: mitigation, no fix available
Siemens SIMATIC STEP 7 Safety V19 <V19_Update_4
affected: fixed in V19, mitigation support.industry.siemens.com
Siemens SIMATIC STEP 7 V16
affected: mitigation, no fix planned
Siemens SIMATIC STEP 7 V17 Siemens SIMATIC STEP 7 V18
affected: mitigation, no fix available
Siemens SIMATIC STEP 7 V19 <V19_Update_4
affected: fixed in V19, mitigation support.industry.siemens.com
Siemens SIMATIC WinCC Unified V16
affected: mitigation, no fix planned
Siemens SIMATIC WinCC Unified V17 Siemens SIMATIC WinCC Unified V18
affected: mitigation, no fix available

show 12 more

Siemens SIMATIC WinCC Unified V19 <V19_Update_4
affected: fixed in V19, mitigation support.industry.siemens.com
Siemens SIMATIC WinCC V16
affected: mitigation, no fix planned
Siemens SIMATIC WinCC V17 Siemens SIMATIC WinCC V18
affected: mitigation, no fix available
Siemens SIMATIC WinCC V19 <V19_Update_4
affected: fixed in V19, mitigation support.industry.siemens.com
Siemens SIMOCODE ES V16
affected: mitigation, no fix planned
Siemens SIMOCODE ES V17 Siemens SIMOCODE ES V18 Siemens SIMOCODE ES V19 Siemens SIMOTION SCOUT TIA V5.4 Siemens SIMOTION SCOUT TIA V5.5
affected: mitigation, no fix available
Siemens SIMOTION SCOUT TIA V5.6 <V5.6_SP1_HF7
affected: fixed in V5.6, mitigation support.industry.siemens.com
Siemens SINAMICS Startdrive V16
affected: mitigation, no fix planned
Siemens SINAMICS Startdrive V17 Siemens SINAMICS Startdrive V18 Siemens SINAMICS Startdrive V19 Siemens SIRIUS Safety ES V17 (TIA Portal) Siemens SIRIUS Safety ES V18 (TIA Portal) Siemens SIRIUS Safety ES V19 (TIA Portal)

+3 more productsfewer

Siemens SIRIUS Soft Starter ES V17 (TIA Portal) Siemens SIRIUS Soft Starter ES V18 (TIA Portal) Siemens SIRIUS Soft Starter ES V19 (TIA Portal)

affected: mitigation, no fix available
Siemens TIA Portal Cloud V16
affected: mitigation, no fix planned
Siemens TIA Portal Cloud V17 Siemens TIA Portal Cloud V18
affected: mitigation, no fix available
Siemens TIA Portal Cloud V19 < 5.2.1.1
affected: vendor fix, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 22 mo ago (2024-12-11)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Siemens SIMATIC S7-PLCSIM V16
Siemens SIMATIC S7-PLCSIM V17
Siemens SIMATIC STEP 7 Safety V16
Siemens SIMATIC STEP 7 Safety V17
Siemens SIMATIC STEP 7 Safety V18
Siemens SIMATIC STEP 7 Safety V19
Siemens SIMATIC STEP 7 V16
Siemens SIMATIC STEP 7 V17
Siemens SIMATIC STEP 7 V18
Siemens SIMATIC STEP 7 V19
Siemens SIMATIC WinCC Unified V16
Siemens SIMATIC WinCC Unified V17
Siemens SIMATIC WinCC Unified V18
Siemens SIMATIC WinCC Unified V19
Siemens SIMATIC WinCC V16
Siemens SIMATIC WinCC V17
Siemens SIMATIC WinCC V18
Siemens SIMATIC WinCC V19
Siemens SIMOCODE ES V16
Siemens SIMOCODE ES V17
Siemens SIMOCODE ES V18
Siemens SIMOCODE ES V19
Siemens SIMOTION SCOUT TIA V5.4
Siemens SIMOTION SCOUT TIA V5.5
Siemens SIMOTION SCOUT TIA V5.6
Siemens SINAMICS Startdrive V16
Siemens SINAMICS Startdrive V17
Siemens SINAMICS Startdrive V18
Siemens SINAMICS Startdrive V19
Siemens SIRIUS Safety ES V17 (TIA Portal)
Siemens SIRIUS Safety ES V18 (TIA Portal)
Siemens SIRIUS Safety ES V19 (TIA Portal)
Siemens SIRIUS Soft Starter ES V17 (TIA Portal)
Siemens SIRIUS Soft Starter ES V18 (TIA Portal)
Siemens SIRIUS Soft Starter ES V19 (TIA Portal)
Siemens TIA Portal Cloud V16
Siemens TIA Portal Cloud V17
Siemens TIA Portal Cloud V18
Siemens TIA Portal Cloud V19

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

cert-portal.siemens.com /productcert/html/ssa-800126.html

Sources

CVE List CVE-2024-49849
NVD CVE-2024-49849

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary