High

CVE-2026-24349 — A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All…

A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All versions), SIMATIC WinCC Unified PC Runtime V17 (All versions), SIMATIC WinCC Unified PC Runtime V18 (All versions), SIMATIC WinCC Unified PC Runtime V19 (All versions), SIMATIC WinCC Unified PC Runtime V20 (All versions), SIMATIC WinCC Unified PC Runtime V21 (All versions < V21 Update 2). Insufficient protection of key material in WinCC Certificate Manager that could allow an attacker to extract sensitive information.

Published Jun 9, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: siemens

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.1% (30-day exploitation probability)+0
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.06%

ahead of 0% of scored CVEs · Oct 14, 2026

Affects

Siemens

Simatic Wincc Unified Pc Runtime and 6 more

CVSS base

7.1

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented mitigation — cert-portal.siemens.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Siemens Simatic Wincc Unified Pc Runtime, Siemens SIMATIC WinCC Unified PC Runtime V16, Siemens SIMATIC WinCC Unified PC Runtime V17…).
Apply the documented mitigations until a definitive fix is available.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Siemens	Simatic Wincc Unified Pc Runtime	≥ 16 and ≤ 20version 21version 21-update1	Vulnerable	NIST National Vulnerability Database
Siemens	SIMATIC WinCC Unified PC Runtime V16	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC WinCC Unified PC Runtime V17	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC WinCC Unified PC Runtime V18	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC WinCC Unified PC Runtime V19	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC WinCC Unified PC Runtime V20	versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC WinCC Unified PC Runtime V21	< V21 Update 2	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.2	CVSS 4.0	High	—	—	productcert@siemens.com via NIST National Vulnerability Database
8.2	CVSS 4.0	High	—	—	siemens via CVE Program (cve.org) e CISA ADP
7.1	CVSS 3.1	High	2.5	4.0	productcert@siemens.com via NIST National Vulnerability Database
7.1	CVSS 3.1	High	—	—	siemens via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N (score shown at the top: productcert@siemens.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-313

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.06%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · siemens/simatic wincc unified pc runtime v16, siemens/simatic wincc unified pc runtime v17, siemens/simatic wincc unifie
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 7.1
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jun 9, 2026 · siemens

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

cert-portal.siemens.com/productcert/html/ssa-063511.html
Mitigation, Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Siemens
every CVE for this vendor

CWE-313
other pages naming this weakness

Related CVEs (same products)

High CVE-2025-30033 Uncontrolled Search Path Element in Siemens Automation License Manager V6.0 Aug 12, 2025
High CVE-2024-52051 Improper Input Validation in Siemens SIMATIC S7-PLCSIM V17 Dec 10, 2024

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-24349 is "A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All…", rated High. It affects Simatic Wincc Unified Pc Runtime (Siemens); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.1 describes technical severity. EPSS 0.06% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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