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Simatic Cp 1242 7 V2 FirmwareOperating system · Siemens

CVE-2022-34820

HIGH · 8.4 CVSS v3.1 Published 2022-07-12
Fix available
A fix is available. Upgrade to 2.2.28 / 3.0.22 or later.
See remediation →
86/100
Remediation priority · High
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 CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions < V3.3.46), SIMATIC CP 1243-7 LTE EU (All versions < V3.3.46), SIMATIC CP 1243-7 LTE US (All versions < V3.3.46), SIMATIC CP 1243-8 IRC (All versions < V3.3.46), SIMATIC CP 1542SP-1 IRC (All versions >= V2.0 < V2.2.28), SIMATIC CP 1543-1 (All versions < V3.0.22), SIMATIC CP 1543SP-1 (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS NET CP 1242-7 V2 (All versions < V3.3.46), SIPLUS NET CP 1543-1 (All versions < V3.0.22), SIPLUS S7-1200 CP 1243-1 (All versions < V3.3.46), SIPLUS S7-1200 CP 1243-1 RAIL (All versions < V3.3.46). The application does not correctly escape some user provided fields during the authentication process. This could allow an attacker to inject custom commands and execute arbitrary code with elevated privileges.

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
How this class of weakness works · CWE-77

User input reaches a command interpreter without being fully separated from the command itself, so an attacker can append instructions of their own. Because those run with the application's privileges, it frequently means control of the host. The lasting fix is to avoid constructing commands from input — call APIs directly and pass arguments as data, never as concatenated strings.

General guidance for the command injection class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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 Cp 1242 7 V2 FirmwareOperating system
Affected:< 3.3.46
Simatic Cp 1243 1 FirmwareOperating system
Affected:< 3.3.46
Simatic Cp 1243 7 Lte Eu FirmwareOperating system
Affected:< 3.3.46
Simatic Cp 1243 7 Lte Us FirmwareOperating system
Affected:< 3.3.46
Simatic Cp 1243 8 Irc FirmwareOperating system
Affected:< 3.3.46
Simatic Cp 1542sp 1 Irc FirmwareOperating system
Affected:>= 2.0, < 2.2.28
Simatic Cp 1543 1 FirmwareOperating system
Affected:< 3.0.22
Simatic Cp 1543sp 1 FirmwareOperating system
Affected:>= 2.0, < 2.2.28

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
Adjacent
Complexity
Low
Privileges
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/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 2.2.28 / 3.0.22 / 3.3.46 or later
Fixed in 2.2.283.0.223.3.46
Vendor patch cert-portal.siemens.com →
Recommended fix High confidence

Upgrade to firmware version 3.3.46 for CP 1242-7 V2, CP 1243-1, CP 1243-7 LTE EU/US, CP 1243-8 IRC; upgrade to firmware version 2.2.28 for CP 1542SP-1 IRC and CP 1543SP-1; upgrade to firmware version 3.0.22 for CP 1543-1

  1. 1. Identify the exact model and current firmware version of the SIMATIC CP device by accessing the device's web interface or using TIA Portal.
  2. 2. Download the corresponding firmware update from Siemens Industry Online Support (https://support.industry.siemens.com/): for CP 1242-7 V2, CP 1243-1, CP 1243-7 LTE EU/US, and CP 1243-8 IRC, download firmware version 3.3.46 or later; for CP 1542SP-1 IRC and CP 1543SP-1, download firmware version 2.2.28 or later; for CP 1543-1, download firmware version 3.0.22 or later.
  3. 3. Create a full backup of the current device configuration using TIA Portal or the device's built-in backup function.
  4. 4. Establish a direct Ethernet connection to the CP device (bypass any intermediate networks) to perform the firmware update.
  5. 5. Upload the new firmware file through the device's web interface under 'Firmware Update' or via TIA Portal's 'Online & Diagnostics' function.
  6. 6. After the firmware update completes, verify the device reports the new version number (3.3.46, 2.2.28, or 3.0.22 as applicable).
  7. 7. Restore the device configuration from the backup created in step 3.
  8. 8. Verify normal operation and test that the authentication functionality works correctly.
Caveat Firmware updates on industrial control devices may reset some network parameters; verify all communication settings and test integration with PLCs after upgrade

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 $3,200. 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-2022-34820 in production — separate from our analysis above.

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