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Simatic Wincc Runtime AdvancedApplication · Siemens

CVE-2021-27384

CRITICAL · 9.8 CVSS v3.1 Published 2021-05-12
Fix available
A fix is available. Upgrade to 15.1 / 16 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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), SINAMICS GH150 (All versions), SINAMICS GL150 (with option X30) (All versions), SINAMICS GM150 (with option X30) (All versions), SINAMICS SH150 (All versions), SINAMICS SL150 (All versions), SINAMICS SM120 (All versions), SINAMICS SM150 (All versions), SINAMICS SM150i (All versions). SmartVNC has an out-of-bounds memory access vulnerability in the device layout handler, represented by a binary data stream on client side, which can potentially result in code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Simatic Wincc Runtime AdvancedApplication
Affected:< 16= 16< 15.1= 15.1
Sinamics Sh150 FirmwareOperating system
Affected:all versions
Sinamics Sm150i FirmwareOperating system
Affected:all versions
Sinamics Gh150 FirmwareOperating system
Affected:all versions
Sinamics Gl150 FirmwareOperating system
Affected:all versions
Sinamics Gm150 FirmwareOperating system
Affected:all versions
Sinamics Sl150 FirmwareOperating system
Affected:all versions
Sinamics Sm120 FirmwareOperating system
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 15.1 / 16 or later
Fixed in 15.116
Vendor patch cert-portal.siemens.com →
Recommended fix High confidence

SIMATIC WinCC Runtime Advanced: V15.1 Update 6 or later; V16 Update 4 or later | Sinamics: Apply patch from SSA-286838

  1. 1. Identify the exact version of Simatic WinCC Runtime Advanced or Sinamics firmware currently installed on the affected device
  2. 2. For SIMATIC WinCC Runtime Advanced V15: Upgrade to V15.1 Update 6 or later
  3. 3. For SIMATIC WinCC Runtime Advanced V16: Upgrade to V16 Update 4 or later
  4. 4. For Sinamics SH150, SM150, SM150i, GH150, GL150, GM150, SL150, SM120: Apply the firmware patch from Siemens Security Note SSA-286838 (reference: https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf)
  5. 5. After patching, verify the SmartVNC service is properly restarted and the vulnerability is no longer exploitable
  6. 6. If direct patching is not immediately feasible, consider network segmentation to limit exposure of the vulnerable service
Caveat Review Siemens patch notes for any configuration or compatibility changes required after applying the update

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,300. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-27384 in production — separate from our analysis above.

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