CVE-2021-22285Network attack vector

Persistent service interruption via out-of-order packet handling

Published Feb 4, 2022 · Updated Sep 16, 2024

Improper exceptional-condition handling in ABB SPIET800 and PNI800 A_B and earlier allows remote attackers to cause persistent service interruption. The communication stack mishandles an incomplete, out-of-order packet sequence and stops answering all Ethernet requests. Network access to the control system is sufficient, and the failure persists until the affected module is manually rebooted.

CVSS severity7.5
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in ABB SPIET800 and PNI800 A_B and earlier allows remote attackers to cause persistent service interruption. The communication stack mishandles an incomplete, out-of-order packet sequence and stops answering all Ethernet requests. Network access to the control system is sufficient, and the failure persists until the affected module is manually rebooted.

The record

CVE
CVE-2021-22285
Published
Feb 4, 2022
Updated
Sep 16, 2024
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
SPIET800
Classifications
CWE-754, CWE-755, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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

7.2ABBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:T/RC:C
7.5ABBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NVDCVSS:3.1/AV:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-755Improper Handling of Exceptional Conditions
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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