CVE-2021-22288Network attack vector

Control-network denial of service via unexpected TCP traffic

Published Feb 4, 2022 · Updated Sep 17, 2024

Improper input validation in ABB SPIET800 and PNI800 firmware A_B and earlier allows remote attackers to halt device communications. Their TCP packet-processing stack mishandles certain unexpected traffic, leaving the IET or PNI component unresponsive until a manual reboot. Access to the control network or a system server is required, and the outage prevents connected operator and engineering systems from transacting with the module.

CVSS severity7.5
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in ABB SPIET800 and PNI800 firmware A_B and earlier allows remote attackers to halt device communications. Their TCP packet-processing stack mishandles certain unexpected traffic, leaving the IET or PNI component unresponsive until a manual reboot. Access to the control network or a system server is required, and the outage prevents connected operator and engineering systems from transacting with the module.

The record

CVE
CVE-2021-22288
Published
Feb 4, 2022
Updated
Sep 17, 2024
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
SPIET800
Classifications
CWE-20, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <=A_B

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · SPIET800version=unspecified <=A_B
GENEREX SYSTEMS Computervertriebsgesellschaft mbH · PNI800version=unspecified <=A_B

Published CVSS scores

7.5Asea Brown Boveri Ltd. (ABB)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.2Asea Brown Boveri Ltd. (ABB)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:T/RC:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-20Improper Input Validation
T0814Denial of Service

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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