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Simatic Cp 1242 7 V2 FirmwareOperating system · Siemens

CVE-2022-43768

HIGH · 7.5 CVSS v3.1 Published 2023-04-11
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 (6GK7242-7KX31-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.3), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.3), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE0) (All versions < V3.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE1) (All versions < V3.3), SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0) (All versions < V3.3), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.3), SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0) (All versions < V3.4.29), SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0) (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0) (All versions < V3.3), SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0) (All versions < V3.4.29), SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0) (All versions < V3.4.29), SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) (All versions < V2.3.6), TIM 1531 IRC (6GK7543-1MX00-0XE0) (All versions < V2.3.6). The webserver of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of the webserver of the affected product.

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 · high confidence

The webserver component in multiple Siemens SIMATIC CP communication processors contains a vulnerability that can be exploited to cause a denial of service condition, rendering the web interface unavailable.

MitigationUpdate the affected devices to the specified fixed versions (V3.4.29, V2.3, or V3.3 depending on product line) following Siemens vendor guidance. Prioritize devices with external network exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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:all versions
Simatic Cp 1243 1 FirmwareOperating system
Affected:all versions
Simatic Cp 1243 1 Dnp3 FirmwareOperating system
Affected:all versions
Simatic Cp 1243 1 Iec FirmwareOperating system
Affected:all versions
Simatic Cp 1243 7 Lte Eu FirmwareOperating system
Affected:all versions
Simatic Cp 1243 7 Lte Us FirmwareOperating system
Affected:all versions
Simatic Cp 1243 8 Irc FirmwareOperating system
Affected:all versions
Simatic Cp 1542sp 1 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
None
Integrity
None
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the SIMATIC CP model
    Access the device via SIMATIC Manager or the device's web interface and record the exact model number (e.g., CP 1242-7, CP 1243-1, CP 1542sp-1)
    Affected if The model matches any of: CP 1242 7 V2, CP 1243 1, CP 1243 1 Dnp3, CP 1243 1 Iec, CP 1243 7 Lte Eu, CP 1243 7 Lte Us, CP 1243 8 Irc, or CP 1542sp 1
  2. Confirm firmware version
    Navigate to the device web interface (System Information page) or use SIMATIC Manager to retrieve the installed firmware version
    Affected if Any firmware version is installed, as all versions of the affected products are vulnerable
  3. Verify webserver component is active
    Attempt to access the device web interface via HTTP/HTTPS using the device IP address (e.g., https://<device-ip>)
    Affected if The web interface is reachable and responds to requests, indicating the webserver component is enabled
  4. Check network accessibility of web interface
    Determine if the device web interface IP is exposed to external networks or untrusted zones by reviewing network segmentation and firewall rules
    Affected if The web interface is accessible from networks beyond the trusted operational technology network

A user is affected if they have any of the listed SIMATIC CP models (CP 1242 7 V2, CP 1243 series, or CP 1542sp 1) with the webserver component enabled and accessible, regardless of firmware version.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update the affected devices to the specified fixed versions (V3.4.29, V2.3, or V3.3 depending on product line) following Siemens vendor guidance. Prioritize devices with external network exposure.

Recommended fix High confidence

V3.4.29 (for CP 124x series), V2.3 (for CP 1542SP-1/1543SP-1), V3.3 (for CP 443-1), V2.3.6 (for TIM 1531 IRC)

  1. 1. Identify the specific SIMATIC CP model number (e.g., 6GK7242-7KX31-0XE0) from the affected device
  2. 2. Access the device management interface to check the current firmware version
  3. 3. Download the appropriate firmware update from Siemens Industry Online Support (support.industry.siemens.com)
  4. 4. For CP 1242-7 V2, CP 1243-1, CP 1243-1 DNP3, CP 1243-1 IEC, CP 1243-7 LTE EU, CP 1243-7 LTE US, and CP 1243-8 IRC: upgrade to firmware version V3.4.29 or later
  5. 5. For CP 1542SP-1, CP 1542SP-1 IRC, and CP 1543SP-1: upgrade to firmware version V2.3 or later
  6. 6. For CP 443-1 and CP 443-1 Advanced: upgrade to firmware version V3.3 or later
  7. 7. For SIPLUS TIM 1531 IRC and TIM 1531 IRC: upgrade to firmware version V2.3.6 or later
  8. 8. After upgrade, verify the webserver is functioning properly and the new version is installed
Caveat Before upgrading, review Siemens release notes for any compatibility considerations or configuration changes required for the new firmware version

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

Fix this in Simatic Cp 1242 7 V2 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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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-2022-43768 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data