CVE-2021-35033

A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.

CVSS v3 7.8 HIGH
CVSS v2.0 6.9 MEDIUM

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.9^/10

CVSS v2.0 : MEDIUM

Vector : AV:L/AC:M/Au:N/C:C/I:C/A:C

Exploitability : 3.4 / Impact : 10.0

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://www.tenable.com/security/research/tra-2022-06	Exploit Third Party Advisory
https://www.zyxel.com/support/Zyxel_security_advisory_for_pre-configured_password_management_vulnerability_of_home_routers_and_WiFi_systems.shtml	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:zyxel:nbg6818_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nbg6818:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:zyxel:nbg7815_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nbg7815:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND

cpe:2.3:o:zyxel:wsq20_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:wsq20:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND

cpe:2.3:o:zyxel:wsq50_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:wsq50:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND

cpe:2.3:o:zyxel:wsq60_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:wsq60:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND

cpe:2.3:o:zyxel:wsr30_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:wsr30:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-11-23 22:15

Updated : 2022-10-27 16:59

NVD link : CVE-2021-35033

Mitre link : CVE-2021-35033

CVE.ORG link : CVE-2021-35033

JSON object : View

Products Affected

zyxel

wsq50_firmware
wsq20
nbg6818_firmware
nbg7815_firmware
wsr30_firmware
wsr30
nbg6818
wsq60
wsq50
wsq20_firmware
wsq60_firmware
nbg7815

CWE

CWE-287

Improper Authentication

CWE-260

Password in Configuration File

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"LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"type": "Secondary", "source": "security@zyxel.com.tw", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2021-11-23T22:15:07.623", "references": [{"url": "https://www.tenable.com/security/research/tra-2022-06", "tags": ["Exploit", "Third Party Advisory"], "source": "security@zyxel.com.tw"}, {"url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_pre-configured_password_management_vulnerability_of_home_routers_and_WiFi_systems.shtml", "tags": ["Vendor Advisory"], "source": "security@zyxel.com.tw"}], "vulnStatus": 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a UART para conectarlo, o si la funcionalidad remote assistance ha sido habilitada por un usuario autenticado"}], "lastModified": "2022-10-27T16:59:30.633", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nbg6818_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1A2D09B3-6B56-483A-AB24-808930548DA4", "versionEndExcluding": "1.00\\(absc.5\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nbg6818:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "48E677C4-EE44-49C4-8CD5-CABE12F00097"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nbg7815_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E77E348E-B055-4D4F-A7E2-3209504DF004", "versionEndExcluding": "1.00\\(absk.7\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nbg7815:-:*:*:*:*:*:*:*", "vulnerable": false, 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