CVE-2022-27640

Device reboot via excessive ARP broadcasts

Published May 10, 2022 · Updated Aug 3, 2024

Denial of service in Siemens SIMATIC CP 442-1 RNA and CP 443-1 RNA before 1.5.18 allows attackers to reboot the device via ARP broadcasts. The communications processor mishandles excessive ARP broadcast requests, allowing an ARP storm to exhaust resources until the module restarts. Exploitation requires access to the same adjacent network and affects availability by forcing a reboot rather than altering or exposing data.

CVSS severity6.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Siemens SIMATIC CP 442-1 RNA and CP 443-1 RNA before 1.5.18 allows attackers to reboot the device via ARP broadcasts. The communications processor mishandles excessive ARP broadcast requests, allowing an ARP storm to exhaust resources until the module restarts. Exploitation requires access to the same adjacent network and affects availability by forcing a reboot rather than altering or exposing data.

The record

CVE
CVE-2022-27640
Published
May 10, 2022
Updated
Aug 3, 2024
Vendor
Siemens
Product
SIMATIC CP 442-1 RNA
Classifications
CWE-400, T1498.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V1.5.18

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC CP 442-1 RNAversion=All versions < V1.5.18
Siemens · SIMATIC CP 443-1 RNAversion=All versions < V1.5.18

Published CVSS scores

6.1NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:C
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1498.001Direct Network Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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