CVE-2021-35029

CVSS V2 High 7.5 CVSS V3 Critical 9.8

Description

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.

Overview

CVE ID
CVE-2021-35029

Assigner
security@zyxel.com.tw

Vulnerability Status
Analyzed

Published Version
2021-07-02T11:15:08

Last Modified Date
2021-07-08T18:20:48

Weakness Enumerations

CWE	URL
CWE-287	http://cwe.mitre.org/data/definitions/287.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
		AND
cpe:2.3:o:zyxel:usg1900_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg1900:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg1100_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg1100:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg310_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg310:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg210_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg210:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg110_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg110:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg40_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg40:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg40w_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg40w:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg60_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg60:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg60w_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg60w:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg300_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg300:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg1000_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg1000:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg2000_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg2000:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg20_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg20:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg20w_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg20w:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg50_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg50:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg100_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg100:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg200_firmware::::::::	1	OR	4.35	4.64
cpe:2.3:h:zyxel:usg200:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg_flex_100_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg_flex_100:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg_flex_200_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg_flex_200:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg_flex_500_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg_flex_500:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg_flex_100w_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg_flex_100w:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg_flex_700_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg_flex_700:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp100_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp100:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp100w_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp100w:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp200_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp200:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp500_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp500:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp700_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp700:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_atp800_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_atp800:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_vpn50_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_vpn50:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_vpn100_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_vpn100:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_vpn300_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_vpn300:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg20-vpn_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg20-vpn:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg20w-vpn_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg20w-vpn:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:usg2200-vpn_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:usg2200-vpn:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_110_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_110:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_310_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_310:-:::::::*	0	OR
		AND
cpe:2.3:o:zyxel:zywall_1100_firmware::::::::	1	OR	4.35	5.01
cpe:2.3:h:zyxel:zywall_1100:-:::::::*	0	OR

CVSS Version 2

Version
2.0

Vector String
AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector
NETWORK

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
PARTIAL

Integrity Impact
PARTIAL

Availability Impact
PARTIAL

Base Score
7.5

Severity
HIGH

Exploitability Score
10

Impact Score
6.4

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
9.8

Base Severity
CRITICAL

Exploitability Score
3.9

Impact Score
5.9

References

Reference URL	Reference Tags
https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml	Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-35029
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35029

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 07:08:24				Added to TrackCVE
2022-12-05 05:21:35	2021-07-02T11:15Z	2021-07-02T11:15:08	CVE Published Date	updated
2022-12-05 05:21:35		2021-07-08T18:20:48	CVE Modified Date	updated
2022-12-05 05:21:35		Analyzed	Vulnerability Status	updated