CVE intelligence and bounded remediation

CVE-2021-22726 — Schneider-Electric Evlink City Evc1S22P4 Firmware security vulnerability

High CVSS 8.1

A CWE-918: Server-Side Request Forgery (SSRF) 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 perform unintended actions or access to data when crafted malicious parameters are submitted to the charging station web server.

Severity
High
CVSS
8.1 (3.1)
Published
2021-07-21
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-918

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

Server-side request forgery and unintended proxying

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Inventory server-side URL fetchers, webhooks, importers, previews, redirects, proxies, and protocol handlers reachable from untrusted input.
  • Map egress paths to internal services, metadata endpoints, loopback, private address space, and privileged control planes.
  • Review DNS resolution, redirect, proxy, credential-forwarding, and URL parsing behavior without requesting sensitive targets.

Remediate safely

  • Replace arbitrary destinations with named integrations or a strict allowlist of schemes, hosts, ports, and paths.
  • Resolve and validate every destination and redirect hop, then enforce egress policy independently of application checks.
  • Remove ambient credentials and sensitive headers from fetchers; apply response size, time, and content limits.

Authoritative sources

Complete CVE record and remediation plan

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