CVE-2021-25661 (GCVE-0-2021-25661)
Vulnerability from cvelistv5 – Published: 2021-05-12 13:18 – Updated: 2026-06-02 19:22
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4). SmartVNC has an out-of-bounds memory access vulnerability that could be triggered on the client side when sending data from the server, which could result in a Denial-of-Service condition.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 19:22 UTC
CWE
- CWE-788 - Access of Memory Location After End of Buffer
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://us-cert.cisa.gov/ics/advisories/icsa-21-131-12 | x_refsource_MISC |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
Impacted products
8 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Siemens | SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) |
Affected:
All versions < V15.1 Update 6
|
guessed | |
| Siemens | SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) |
Affected:
All versions < V16 Update 4
|
guessed | |
| Siemens | SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) |
Affected:
All versions < V15.1 Update 6
|
guessed | |
| Siemens | SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) |
Affected:
All versions < V16 Update 4
|
guessed | |
| Siemens | SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F |
Affected:
All versions < V15.1 Update 6
|
guessed | |
| Siemens | SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F |
Affected:
All versions < V16 Update 4
|
guessed | |
| Siemens | SIMATIC WinCC Runtime Advanced V15 |
Affected:
All versions < V15.1 Update 6
|
guessed | |
| Siemens | SIMATIC WinCC Runtime Advanced V16 |
Affected:
All versions < V16 Update 4
|
guessed |
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"title": "CVE Program Container"
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"metrics": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
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"integrityImpact": "NONE",
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},
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"other": {
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"id": "CVE-2021-25661",
"options": [
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"Exploitation": "none"
},
{
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},
{
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],
"role": "CISA Coordinator",
"timestamp": "2026-06-02T19:22:48.003542Z",
"version": "2.0.3"
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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"versions": [
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"vendor": "Siemens",
"versions": [
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"version": "All versions \u003c V16 Update 4"
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]
},
{
"product": "SIMATIC HMI Comfort Panels V15 4\\\" - 22\\\" (incl. SIPLUS variants)",
"vendor": "Siemens",
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"status": "affected",
"version": "All versions \u003c V15.1 Update 6"
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]
},
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"product": "SIMATIC HMI Comfort Panels V16 4\\\" - 22\\\" (incl. SIPLUS variants)",
"vendor": "Siemens",
"versions": [
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"version": "All versions \u003c V16 Update 4"
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},
{
"product": "SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F",
"vendor": "Siemens",
"versions": [
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"status": "affected",
"version": "All versions \u003c V15.1 Update 6"
}
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"product": "SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F",
"vendor": "Siemens",
"versions": [
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"status": "affected",
"version": "All versions \u003c V16 Update 4"
}
]
},
{
"product": "SIMATIC WinCC Runtime Advanced V15",
"vendor": "Siemens",
"versions": [
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"status": "affected",
"version": "All versions \u003c V15.1 Update 6"
}
]
},
{
"product": "SIMATIC WinCC Runtime Advanced V16",
"vendor": "Siemens",
"versions": [
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"version": "All versions \u003c V16 Update 4"
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}
],
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}
}
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},
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"dateReserved": "2021-01-21T00:00:00.000Z",
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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