The FANUC R-30iA and R-30iB series controllers are vulnerable to integer coercion errors, which cause the device to crash.

published 2022-01-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19717

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

The FANUC R-30iA and R-30iB series controllers are vulnerable to integer coercion errors, which cause the device to crash. A restart is required.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-243-02 updated 2022-02-03 cvss 7.4

FANUC Robot Controllers (Update A)

FANUC R-30iA R-30iA Mate 7, 7.20, 7.30, 7.40, 7.43, 7.50, 7.63, 7.70
affected: mitigation “FANUC is recommending the following, both of which are documented in FANUC's Internet Setup and Operations Manual” fanuc.co.jp

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 18 mo ago (2025-04-17)

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

FANUC R-30iA, R-30iA Mate
FANUC R-30iB, R-30iB Mate, R-30iB Compact
FANUC R-30iB Plus, R-30iB Mate Plus, R-30iB Compact Plus, R-30iB Mini Plus

Classification

Weakness

CWE-192 Integer Coercion Error
CWE-681 Incorrect Conversion between Numeric Types

References

cisa.gov /uscert/ics/advisories/icsa-21-243-02
third-party-advisory, us-government-resource

Sources

CVE List CVE-2021-32996
NVD CVE-2021-32996

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary