High

CVE-2023-29105 — A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1...

A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1), SIMATIC Cloud Connect 7 CC712 (All versions < V2.1), SIMATIC Cloud Connect 7 CC716 (All versions >= V2.0 < V2.1), SIMATIC Cloud Connect 7 CC716 (All versions < V2.1). The affected device is vulnerable to a denial of service while parsing a random (non-JSON) MQTT payload. This could allow an attacker who can manipulate the communication between the MQTT broker and the affected device to cause a denial of service (DoS).

Published May 9, 2023 · Updated Oct 23, 2026 · Sources: CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · 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 0.6% (30-day exploitation probability)+7
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

0.55%

ahead of 46% of scored CVEs · Oct 30, 2026

Affects

Siemens

6gk1411-1ac00 Firmware and 3 more

CVSS base

7.5

High · 4 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 patch — 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 6gk1411-1ac00 Firmware, Siemens 6gk1411-5ac00 Firmware, Siemens SIMATIC Cloud Connect 7 CC712…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
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	6gk1411-1ac00 Firmware	< 2.1	Vulnerable	NIST National Vulnerability Database
Siemens	6gk1411-5ac00 Firmware	< 2.1	Vulnerable	NIST National Vulnerability Database
Siemens	SIMATIC Cloud Connect 7 CC712	version All versions >= V2.0 < V2.1version All versions < V2.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	SIMATIC Cloud Connect 7 CC716	version All versions >= V2.0 < V2.1version All versions < V2.1	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

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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
7.5	CVSS 3.1	High	3.9	3.6	nvd@nist.gov via NIST National Vulnerability Database
5.9	CVSS 3.1	Medium	2.2	3.6	productcert@siemens.com via NIST National Vulnerability Database
5.9	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories
5.9	CVSS 3.1	Medium	—	—	siemens via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 7.5 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-544

Other CVEs with this weakness →

EPSS over time FIRST

Oct 23, 2026 → Oct 30, 2026 · 8 reading(s) · max 0.55%

Detection

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

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Fix documented
Oct 23, 2026 · NIST National Vulnerability Database
Affected products added · siemens/6gk1411-1ac00 firmware, siemens/6gk1411-5ac00 firmware
Oct 23, 2026 · NIST National Vulnerability Database
CVSS changed · 5.9 → 7.5
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · Published → Modified
Oct 23, 2026 · NIST National Vulnerability Database
Record published
Oct 23, 2026
Affected products added · siemens/simatic cloud connect 7 cc712, siemens/simatic cloud connect 7 cc716
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
CVSS changed · 5.9
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Record created in this database
Oct 23, 2026 · Alertas do Telegram
2023
CVE published
May 9, 2023 · siemens

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 23, 2026 – Oct 23, 2026
1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

3 on the record

cert-portal.siemens.com/productcert/pdf/ssa-555292.pdf
Patch, Vendor Advisory, CVE Program (cve.org) e CISA ADP
nvd.nist.gov/vuln/detail/CVE-2023-29105
GitHub Security Advisories
github.com/advisories/GHSA-fr6w-4xgh-4mgc
GitHub Security Advisories

Elsewhere on this site

Siemens
every CVE for this vendor

CWE-544
other pages naming this weakness

Related CVEs (same products)

High CVE-2023-29106 A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1... May 9, 2023
High CVE-2023-29104 A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1... May 9, 2023
Low CVE-2023-29128 A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1... May 9, 2023
Medium CVE-2023-29107 A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1... May 9, 2023

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-2023-29105 is "A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1...", rated High. It affects 6gk1411-1ac00 Firmware (Siemens); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. EPSS 0.55% 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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