CVE-2021-35029 : An authentication bypasss vulnerability in the web-based management interface of

An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote attacker to execute arbitrary commands on an affected device.

Published 2021-07-02 11:15:09

Updated 2021-07-08 18:20:48

Source Zyxel Corporation

View at NVD, CVE.org

Vulnerability category: BypassGain privilege

Products affected by CVE-2021-35029

Zyxel » Usg50 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg50_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg50 » Version: N/A
Zyxel » Zywall 110 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_110_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 110 » Version: N/A
Zyxel » Zywall 1100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_1100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 1100 » Version: N/A
Zyxel » Zywall 310 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_310_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 310 » Version: N/A
Zyxel » Usg20-vpn Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20-vpn » Version: N/A
Zyxel » Usg20w-vpn Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20w-vpn » Version: N/A
Zyxel » Usg40 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg40_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg40 » Version: N/A
Zyxel » Usg40w Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg40w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg40w » Version: N/A
Zyxel » Usg60 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg60_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg60 » Version: N/A
Zyxel » Usg60w Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg60w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg60w » Version: N/A
Zyxel » Usg110 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg110 » Version: N/A
Zyxel » Usg210 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg210 » Version: N/A
Zyxel » Usg310 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg310 » Version: N/A
Zyxel » Usg1100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg1100 » Version: N/A
Zyxel » Usg1900 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg1900 » Version: N/A
Zyxel » Usg2200-vpn Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg2200-vpn_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg2200-vpn » Version: N/A
Zyxel » Zywall Vpn100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn100 » Version: N/A
Zyxel » Zywall Vpn300 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn300 » Version: N/A
Zyxel » Usg300 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg300_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg300 » Version: N/A
Zyxel » Usg1000 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg1000_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg1000 » Version: N/A
Zyxel » Usg2000 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg2000_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg2000 » Version: N/A
Zyxel » Usg20 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg20_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20 » Version: N/A
Zyxel » Usg20w Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg20w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20w » Version: N/A
Zyxel » Usg100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg100 » Version: N/A
Zyxel » Usg200 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 4.64
cpe:2.3:o:zyxel:usg200_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg200 » Version: N/A
Zyxel » Usg Flex 100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 100 » Version: N/A
Zyxel » Usg Flex 200 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 200 » Version: N/A
Zyxel » Usg Flex 500 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 500 » Version: N/A
Zyxel » Usg Flex 100w Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 100w » Version: N/A
Zyxel » Usg Flex 700 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 700 » Version: N/A
Zyxel » Zywall Atp100 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp100 » Version: N/A
Zyxel » Zywall Atp100w Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp100w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp100w » Version: N/A
Zyxel » Zywall Atp200 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp200_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp200 » Version: N/A
Zyxel » Zywall Atp500 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp500_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp500 » Version: N/A
Zyxel » Zywall Atp700 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp700_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp700 » Version: N/A
Zyxel » Zywall Atp800 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_atp800_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Atp800 » Version: N/A
Zyxel » Zywall Vpn50 Firmware
Versions from including (>=) 4.35 and up to, including, (<=) 5.01
cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn50 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-35029

EPSS FAQ

0.70%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 80 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-35029

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	Zyxel Corporation
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-35029

CWE-287 Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Assigned by:
- nvd@nist.gov (Primary)
- security@zyxel.com.tw (Secondary)

References for CVE-2021-35029

https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml

404 Error | Zyxel
Vendor Advisory

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Vulnerability Details : CVE-2021-35029

Products affected by CVE-2021-35029

Exploit prediction scoring system (EPSS) score for CVE-2021-35029

CVSS scores for CVE-2021-35029

CWE ids for CVE-2021-35029

References for CVE-2021-35029