CVE-2021-22286Network attack vector

Service interruption via malformed IET packet values

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 interrupt service via IET packets. The communication stack accepts invalid values in malformed IET protocol packets and leaves either interface unresponsive until manually rebooted. Access to the site's control network is required; the outage blocks workstation data transactions without changing configuration data or disrupting the control network.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in ABB SPIET800 and PNI800 firmware A_B and earlier allows remote attackers to interrupt service via IET packets. The communication stack accepts invalid values in malformed IET protocol packets and leaves either interface unresponsive until manually rebooted. Access to the site's control network is required; the outage blocks workstation data transactions without changing configuration data or disrupting the control network.

The record

CVE
CVE-2021-22286
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

7.5ABBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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-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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo