CVE intelligence and bounded remediation

CVE-2021-22730 — Schneider-Electric Evlink City Evc1S22P4 Firmware security vulnerability

Critical CVSS 9.8

A CWE-798: Use of Hard-coded Credentials 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 an attacker to gain unauthorized administrative privileges when accessing to the charging station web server.

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-07-21
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-798

Affected products

  • schneider-electric / evlink_city_evc1s22p4_firmware
  • schneider-electric / evlink_city_evc1s7p4_firmware
  • schneider-electric / evlink_parking_evw2_firmware
  • schneider-electric / evlink_parking_evf2_firmware
  • schneider-electric / evlink_parking_ev.2_firmware
  • schneider-electric / evlink_smart_wallbox_evb1a_firmware

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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