CVE-2021-32998Network attack vector

Remote code execution via undisclosed out-of-bounds write

Published Jan 7, 2022 · Updated Apr 17, 2025

Out-of-bounds write in FANUC R-30iA and R-30iB controllers allows remote attackers to execute arbitrary code over a network. FANUC has not disclosed the affected component or input, but lists R-30iA 7 through 7.70, R-30iB 8 through 8.36, and R-30iB Plus 9 through 9.40. The attack requires no privileges or user interaction and can corrupt controller data and stop system software without exposing controller information.

CVSS severity7.4
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in FANUC R-30iA and R-30iB controllers allows remote attackers to execute arbitrary code over a network. FANUC has not disclosed the affected component or input, but lists R-30iA 7 through 7.70, R-30iB 8 through 8.36, and R-30iB Plus 9 through 9.40. The attack requires no privileges or user interaction and can corrupt controller data and stop system software without exposing controller information.

The record

CVE
CVE-2021-32998
Published
Jan 7, 2022
Updated
Apr 17, 2025
Vendor
FANUC Corporation
Product
R-30iA Controller
Classifications
CWE-787, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record 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=v7 <=v7.70

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FANUC Corporation · R-30iA Controllerversion=v7 <=v7.70
FANUC Corporation · R-30iB Plus Controllerversion=V9 <=v9.40
FANUC Corporation · R-30iB Controllerversion=v8 <=v8.36

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
8.8NIST NVDAV:N/AC:M/Au:N/C:N/I:C/A:C
7.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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 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-787Out-of-bounds Write
T0866Exploitation of Remote Services

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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