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Simatic Cp 1242 7 V2 FirmwareOperating system · Siemens

CVE-2022-43767

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 · moderate 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. An attacker sending specially crafted requests to the webserver can render it unavailable, likely through resource exhaustion or a crash condition.

MitigationUpdate the affected devices to the fixed versions: V3.4.29 for CP 1242/1243 series, V2.3 for CP 1542SP/1543SP series, V3.3 for CP 443-1 series, and V2.3.6 for TIM 1531 IRC.

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 device model
    Access the device via its web interface or check the device nameplate/label, or query the device through its management interface (e.g., via STEP 7/TIA Portal or SNMP). Confirm the exact model number matches one of: CP 1242-7, 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.
    Affected if The device is any of these eight CP models.
  2. Verify firmware version
    Log into the device web interface or use management software (TIA Portal, STEP 7) to read the installed firmware version. Compare against the known affected range.
    Affected if The device is any of the affected CP models running any firmware version (all versions are affected).
  3. Confirm webserver is enabled
    Access the device configuration via its web interface or management software. Navigate to the webserver settings (typically under Web Server or HTTP/HTTPS configuration settings). Check if the webserver feature is activated.
    Affected if The webserver component is enabled and accessible on the device.
  4. Check webserver network accessibility
    Attempt to reach the device web interface from an authorized network segment using a browser or HTTP tool (e.g., curl http://<device-ip>/). Determine if port 80 (HTTP) or 443 (HTTPS) is open and responding.
    Affected if The device webserver is network-accessible, making it exploitable by an attacker on the same network.

If the device is any of the listed CP models and has its webserver enabled and network-accessible, it is vulnerable to CVE-2022-43767 and can be knocked offline via specially crafted HTTP requests.

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 fixed versions: V3.4.29 for CP 1242/1243 series, V2.3 for CP 1542SP/1543SP series, V3.3 for CP 443-1 series, and V2.3.6 for TIM 1531 IRC.

Recommended fix High confidence

Firmware V3.4.29 for CP 124x series; V2.3 for CP 1542SP-1/IRC series; V3.3 for CP 443-1 series; V2.3.6 for TIM 1531 IRC

  1. Identify the specific SIMATIC CP model in use (e.g., CP 1242-7 V2, CP 1542SP-1, etc.)
  2. Determine the current firmware version by accessing the device's web interface or using TIA Administration console
  3. Download the latest firmware version from Siemens Industry Online Support (support.industry.siemens.com) - for CP 124x series use V3.4.29 or later, for CP 1542SP-1/IRC use V2.3 or later, for CP 443-1 use V3.3 or later
  4. Back up the current device configuration
  5. Access the device web interface and navigate to the firmware update section, or use SIMATIC NET PC Software for network-based updates
  6. Upload and install the new firmware version
  7. Restart the device to complete the firmware update
  8. Verify the webserver is accessible and functioning after reboot
Caveat Review Siemens firmware release notes for any configuration changes required; firmware update may temporarily interrupt communications

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
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,980
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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-2022-43767 in production — separate from our analysis above.

No notes yet

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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