CVE-2021-43986

Privilege escalation via writable installation binaries

Published Apr 20, 2022 · Updated Apr 16, 2025

Improper access control in FANUC ROBOGUIDE before 9.40083.00.05 (Rev T) allows local users to gain privileges by replacing binaries. The setup program grants full access to product files and folders, allowing unauthorized replacement of original binaries. Exploitation requires local low-privileged access and user interaction; a replaced binary can execute with elevated privileges and disrupt the PC.

CVSS severity6.0
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in FANUC ROBOGUIDE before 9.40083.00.05 (Rev T) allows local users to gain privileges by replacing binaries. The setup program grants full access to product files and folders, allowing unauthorized replacement of original binaries. Exploitation requires local low-privileged access and user interaction; a replaced binary can execute with elevated privileges and disrupt the PC.

The record

CVE
CVE-2021-43986
Published
Apr 20, 2022
Updated
Apr 16, 2025
Vendor
FANUC Corporation
Product
ROBOGUIDE
Classifications
CWE-284, CWE-276
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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=All <v9.40083.00.05 (Rev T)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

FANUC Corporation · ROBOGUIDEversion=All <v9.40083.00.05 (Rev T)

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P
6.0ICS-CERTCVSS:3.1/AV:L/AC:H/PR:L/UI:R/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-276Incorrect Default Permissions

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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