CVE-2021-22707

published 2021-07-21

CVE-2021-22707: 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 /…

Priority P1 90 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

ITW EXPLOIT VulnCheck KEV

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 allow an attacker to issue unauthorized commands to the charging station web server with administrative privileges.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
schneider-electric	evlink_city_evc1s22p4_firmware	< r8_v3.4.0.1	r8_v3.4.0.1
schneider-electric	evlink_city_evc1s7p4_firmware	< r8_v3.4.0.1	r8_v3.4.0.1
schneider-electric	evlink_parking_ev.2_firmware	< r8_v3.4.0.1	r8_v3.4.0.1
schneider-electric	evlink_parking_evf2_firmware	< r8_v3.4.0.1	r8_v3.4.0.1
schneider-electric	evlink_parking_evw2_firmware	< r8_v3.4.0.1	r8_v3.4.0.1
schneider-electric	evlink_smart_wallbox_evb1a_firmware	< r8_v3.4.0.1	r8_v3.4.0.1

Detection & IOCs extracted from sources · hover to see the quote

cookie CURLTOKEN=b35fcdc1ea1221e6dd126e172a0131c5a; SESSIONID=admin↗

path /cgi-bin/cgiServer?worker=IndexNew↗

• → Detect exploitation attempts by matching HTTP requests to /cgi-bin/cgiServer?worker=IndexNew with the hardcoded cookie values CURLTOKEN=b35fcdc1ea1221e6dd126e172a0131c5a and SESSIONID=admin ↗
• → Successful exploitation returns HTTP 200 with the response body containing the string '?worker=Cluster" name="cluster" id="id_cluster', indicating administrative access was granted via hardcoded credentials ↗
• → Use Shodan/FOFA queries to identify exposed EVlink charging station web interfaces as potential targets: title 'EVSE web interface' ↗

• · The hardcoded credentials (CURLTOKEN and SESSIONID=admin) are baked into the firmware of affected devices and cannot be changed by users; all versions prior to R8 V3.4.0.1 across EVlink City, EVlink Parking, and EVlink Smart Wallbox product lines are affected ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 10.0 CRITICAL AV:N/AC:L/Au:N/C:C/I:C/A:C

vulncheck 9.8 CRITICAL

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CWE-798