How severe is CVE-2020-12739?

CVE-2020-12739 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2020-12739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12739?

CVE-2020-12739 primarily affects Fanuc Series 30i Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-12739?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-12739 published?

CVE-2020-12739 was published on 2020-08-03 and last updated on 2026-06-17.

CVE-2020-12739

CVE-2020-12739 is a medium-severity vulnerability in Fanuc Series 30i Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Fanuc Series 30i Firmware
Published: 2020-08-03
Last modified: 2026-06-17

Description

A denial-of-service vulnerability in the Fanuc i Series CNC (0i-MD and 0i Mate-MD) could allow an unauthenticated, remote attacker to cause an affected CNC to become inaccessible to other devices.

Frequently asked questions

What is CVE-2020-12739?: A denial-of-service vulnerability in the Fanuc i Series CNC (0i-MD and 0i Mate-MD) could allow an unauthenticated, remote attacker to cause an affected CNC to become inaccessible to other devices.
How severe is CVE-2020-12739?: CVE-2020-12739 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2020-12739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12739?: CVE-2020-12739 primarily affects Fanuc Series 30i Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-12739?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-12739 published?: CVE-2020-12739 was published on 2020-08-03 and last updated on 2026-06-17.

References

Affected products (16)

cpe:2.3:o:fanuc:series_30i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_31i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_32i-b_plus_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_35i-b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:power_motion_i-model_a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-model_f_plus_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-model_f_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_32i-model_a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-model_d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-mate_d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-model_c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_16i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_18i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_21i-model_b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_0i-model_b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:fanuc:series_18i-wb_firmware:-:*:*:*:*:*:*:*

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