CVE-2021-22708

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-21 · updated 2026-06-17
Weakness: CWE-347

Description

A CWE-347: Improper Verification of Cryptographic Signature vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to craft a malicious firmware package and bypass the signature verification mechanism.

Affected products

Schneider-Electric Evlink City Evc1S22P4 Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1
Schneider-Electric Evlink City Evc1S7P4 Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1
Schneider-Electric Evlink Parking Ev.2 Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1
Schneider-Electric Evlink Parking Evf2 Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1
Schneider-Electric Evlink Parking Evw2 Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1
Schneider-Electric Evlink Smart Wallbox Evb1A Firmware: before r8_v3.4.0.1 — fixed in r8_v3.4.0.1

How to fix

Upgrade to a fixed version: Schneider-Electric Evlink City Evc1S22P4 Firmware r8_v3.4.0.1; Schneider-Electric Evlink City Evc1S7P4 Firmware r8_v3.4.0.1; Schneider-Electric Evlink Parking Ev.2 Firmware r8_v3.4.0.1; Schneider-Electric Evlink Parking Evf2 Firmware r8_v3.4.0.1; Schneider-Electric Evlink Parking Evw2 Firmware r8_v3.4.0.1; Schneider-Electric Evlink Smart Wallbox Evb1A Firmware r8_v3.4.0.1. Check the vendor advisory for mitigations.

References

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