How severe is CVE-2023-3346?

CVE-2023-3346 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-3346 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3346?

CVE-2023-3346 primarily affects Mitsubishielectric C80 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3346?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-3346 published?

CVE-2023-3346 was published on 2023-08-03 and last updated on 2026-06-17.

CVE-2023-3346

CVE-2023-3346 is a critical-severity vulnerability in Mitsubishielectric C80 Firmware with a CVSS 3.x base score of 9.8. 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Mitsubishielectric C80 Firmware
Published: 2023-08-03
Last modified: 2026-06-17

Description

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in MITSUBSHI CNC Series allows a remote unauthenticated attacker to cause Denial of Service (DoS) condition and execute arbitrary code on the product by sending specially crafted packets. In addition, system reset is required for recovery.

Frequently asked questions

What is CVE-2023-3346?: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in MITSUBSHI CNC Series allows a remote unauthenticated attacker to cause Denial of Service (DoS) condition and execute arbitrary code on the product by sending specially crafted packets. In addition, system reset is required for recovery.
How severe is CVE-2023-3346?: CVE-2023-3346 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-3346 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3346?: CVE-2023-3346 primarily affects Mitsubishielectric C80 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3346?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-3346 published?: CVE-2023-3346 was published on 2023-08-03 and last updated on 2026-06-17.

References

Affected products (21)

cpe:2.3:o:mitsubishielectric:c80_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:e70_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:e80_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m70v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m720vs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m720vs_15-type_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m720vw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m730vs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m730vs_15-type_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m730vw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m750vs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m750vs_15-type_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m750vw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m80_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m800s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m800vs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m800vw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m800w_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m80v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m80vw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:m80w_firmware:-:*:*:*:*:*:*:*

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