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.

Published: 2022-04-03 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-30066 is rated Low Risk (27.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.00%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-30066

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.05% 0.00% -0.05%
2 2023-03-07 0.89% 0.05% -0.83%
3 2022-04-04 — 0.89% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-30066

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 3.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.9 5.9 [email protected]
7.2 2.0 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2021-30066

Affected software / configurations for CVE-2021-30066

Vendor Product Version Raw CPE
belden tofino_xenon_security_appliance_firmware < 03.2.03 cpe:2.3:o:belden:tofino_xenon_security_appliance_firmware:*:*:*:*:*:*:*:*
belden tofino_argon_fa-tsa-220-tx\/mm_firmware — cpe:2.3:o:belden:tofino_argon_fa-tsa-220-tx\/mm_firmware:-:*:*:*:*:*:*:*
belden tofino_argon_fa-tsa-220-tx\/tx_firmware — cpe:2.3:o:belden:tofino_argon_fa-tsa-220-tx\/tx_firmware:-:*:*:*:*:*:*:*
belden tofino_argon_fa-tsa-220-mm\/tx_firmware — cpe:2.3:o:belden:tofino_argon_fa-tsa-220-mm\/tx_firmware:-:*:*:*:*:*:*:*
belden tofino_argon_fa-tsa-220-mm\/mm_firmware — cpe:2.3:o:belden:tofino_argon_fa-tsa-220-mm\/mm_firmware:-:*:*:*:*:*:*:*
belden tofino_argon_fa-tsa-100-tx\/tx_firmware — cpe:2.3:o:belden:tofino_argon_fa-tsa-100-tx\/tx_firmware:-:*:*:*:*:*:*:*
belden eagle_20_tofino_943_987-505-mm\/mm_firmware — cpe:2.3:o:belden:eagle_20_tofino_943_987-505-mm\/mm_firmware:-:*:*:*:*:*:*:*
belden eagle_20_tofino_943_987-504-mm\/tx_firmware — cpe:2.3:o:belden:eagle_20_tofino_943_987-504-mm\/tx_firmware:-:*:*:*:*:*:*:*
belden eagle_20_tofino_943_987-502_-tx\/mm_firmware — cpe:2.3:o:belden:eagle_20_tofino_943_987-502_-tx\/mm_firmware:-:*:*:*:*:*:*:*
belden eagle_20_tofino_943_987-501-tx\/tx_firmware — cpe:2.3:o:belden:eagle_20_tofino_943_987-501-tx\/tx_firmware:-:*:*:*:*:*:*:*
schneider-electric tcsefea23f3f20_firmware — cpe:2.3:o:schneider-electric:tcsefea23f3f20_firmware:-:*:*:*:*:*:*:*
schneider-electric tcsefea23f3f21_firmware — cpe:2.3:o:schneider-electric:tcsefea23f3f21_firmware:-:*:*:*:*:*:*:*
schneider-electric tcsefea23f3f22_firmware < 03.23 cpe:2.3:o:schneider-electric:tcsefea23f3f22_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-30066

cvelogic Threat Intelligence