How severe is CVE-2021-30066?

CVE-2021-30066 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-30066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30066?

CVE-2021-30066 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-2021-30066?

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

When was CVE-2021-30066 published?

CVE-2021-30066 was published on 2022-04-03 and last updated on 2026-06-17.

CVE-2021-30066

CVE-2021-30066 is a medium-severity vulnerability in Belden Tofino Xenon Security Appliance Firmware with a CVSS 3.x base score of 6.8. 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-347.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
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, an arbitrary firmware image can be loaded because firmware signature verification (for a USB stick) can be bypassed. NOTE: this issue exists because of an incomplete fix of CVE-2017-11400.

Frequently asked questions

What is CVE-2021-30066?: On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance, an arbitrary firmware image can be loaded because firmware signature verification (for a USB stick) can be bypassed. NOTE: this issue exists because of an incomplete fix of CVE-2017-11400.
How severe is CVE-2021-30066?: CVE-2021-30066 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-30066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30066?: CVE-2021-30066 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-2021-30066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-30066 published?: CVE-2021-30066 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-2021-30065 — High (CVSS 7.5): On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon…
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,…

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