How severe is CVE-2021-30065?

CVE-2021-30065 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-30065 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30065?

CVE-2021-30065 primarily affects Belden Tofino Xenon Security Appliance Firmware. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-30065?

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

When was CVE-2021-30065 published?

CVE-2021-30065 was published on 2022-04-03 and last updated on 2026-06-17.

CVE-2021-30065

CVE-2021-30065 is a high-severity vulnerability in Belden Tofino Xenon Security Appliance Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Belden Tofino Xenon Security Appliance Firmware
Published: 2022-04-03
Last modified: 2026-06-17

Description

On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance, crafted ModBus packets can bypass the ModBus enforcer. NOTE: this issue exists because of an incomplete fix of CVE-2017-11401.

Frequently asked questions

What is CVE-2021-30065?: On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance, crafted ModBus packets can bypass the ModBus enforcer. NOTE: this issue exists because of an incomplete fix of CVE-2017-11401.
How severe is CVE-2021-30065?: CVE-2021-30065 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-30065 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30065?: CVE-2021-30065 primarily affects Belden Tofino Xenon Security Appliance Firmware. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-30065?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-30065 published?: CVE-2021-30065 was published on 2022-04-03 and last updated on 2026-06-17.

References

Affected products (13)

cpe:2.3:o:belden:tofino_xenon_security_appliance_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:belden:tofino_argon_fa-tsa-220-tx\/mm_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:tofino_argon_fa-tsa-220-tx\/tx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:tofino_argon_fa-tsa-220-mm\/tx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:tofino_argon_fa-tsa-220-mm\/mm_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:tofino_argon_fa-tsa-100-tx\/tx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:eagle_20_tofino_943_987-505-mm\/mm_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:eagle_20_tofino_943_987-504-mm\/tx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:eagle_20_tofino_943_987-502_-tx\/mm_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:belden:eagle_20_tofino_943_987-501-tx\/tx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tcsefea23f3f20_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tcsefea23f3f21_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tcsefea23f3f22_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Belden Tofino Xenon Security Appliance Firmware

CVE-2021-30064 — Critical (CVSS 9.8): On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon…
CVE-2017-11402 — Critical (CVSS 9.8): An issue has been discovered on the Belden Hirschmann Tofino Xenon Security Appliance before 03.2.00. Design flaws in…
CVE-2017-11401 — Critical (CVSS 9.8): An issue has been discovered on the Belden Hirschmann Tofino Xenon Security Appliance before 03.2.00. Improper handling…
CVE-2021-30063 — High (CVSS 7.5): On Schneider Electric ConneXium Tofino OPCLSM TCSEFM0000 before 03.23 and Belden Tofino Xenon Security Appliance,…
CVE-2021-30062 — High (CVSS 7.5): On Schneider Electric ConneXium Tofino OPCLSM TCSEFM0000 before 03.23 and Belden Tofino Xenon Security Appliance,…
CVE-2021-30066 — Medium (CVSS 6.8): On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon…

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