9.8
CRITICAL
CVE-2021-35029
Zyxel USG/Zywall Authentication Bypass RCE
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.

INFO

Published Date :

July 2, 2021, 11:15 a.m.

Last Modified :

Nov. 21, 2024, 6:11 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2021-35029 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-35029 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zyxel usg20-vpn_firmware
2 Zyxel usg20w-vpn_firmware
3 Zyxel usg40_firmware
4 Zyxel usg40w_firmware
5 Zyxel usg60_firmware
6 Zyxel usg60w_firmware
7 Zyxel usg110_firmware
8 Zyxel usg210_firmware
9 Zyxel usg310_firmware
10 Zyxel usg1100_firmware
11 Zyxel usg1900_firmware
12 Zyxel zywall_110_firmware
13 Zyxel zywall_1100_firmware
14 Zyxel zywall_310_firmware
15 Zyxel usg_110_firmware
16 Zyxel usg_flex_100_firmware
17 Zyxel usg_flex_100w_firmware
18 Zyxel usg_flex_200_firmware
19 Zyxel usg_flex_500_firmware
20 Zyxel usg_flex_700_firmware
21 Zyxel zywall_vpn100_firmware
22 Zyxel zywall_vpn300_firmware
23 Zyxel zywall_vpn50_firmware
24 Zyxel zywall_atp100_firmware
25 Zyxel zywall_atp100w_firmware
26 Zyxel zywall_atp200_firmware
27 Zyxel zywall_atp500_firmware
28 Zyxel zywall_atp700_firmware
29 Zyxel zywall_atp800_firmware
30 Zyxel usg2200-vpn_firmware
31 Zyxel vpn100_firmware
32 Zyxel atp100_firmware
33 Zyxel usg300_firmware
34 Zyxel usg1000_firmware
35 Zyxel usg2000_firmware
36 Zyxel usg20_firmware
37 Zyxel usg20w_firmware
38 Zyxel usg50_firmware
39 Zyxel usg100_firmware
40 Zyxel usg200_firmware
41 Zyxel usg_flex_100
42 Zyxel usg_flex_200
43 Zyxel usg_flex_500
44 Zyxel usg_flex_700
45 Zyxel usg_flex_100w
46 Zyxel usg20-vpn
47 Zyxel usg20w-vpn
48 Zyxel usg40
49 Zyxel usg40w
50 Zyxel usg60
51 Zyxel usg60w
52 Zyxel usg110
53 Zyxel usg210
54 Zyxel usg310
55 Zyxel usg1100
56 Zyxel usg1900
57 Zyxel usg50
58 Zyxel zywall_110
59 Zyxel zywall_1100
60 Zyxel zywall_310
61 Zyxel usg2200-vpn
62 Zyxel zywall_vpn100
63 Zyxel zywall_vpn300
64 Zyxel usg300
65 Zyxel usg1000
66 Zyxel usg2000
67 Zyxel usg20
68 Zyxel usg20w
69 Zyxel usg100
70 Zyxel usg200
71 Zyxel zywall_atp100
72 Zyxel zywall_atp100w
73 Zyxel zywall_atp200
74 Zyxel zywall_atp500
75 Zyxel zywall_atp700
76 Zyxel zywall_atp800
77 Zyxel zywall_vpn50
: Total Affected Vendor : 1 | Products : 77
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-35029.

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

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

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IamAlch3mist/Awesome-Embedded-Systems-Vulnerability-Research

Resources to getting started vulnerability research on IoT/embedded devices.

Updated: 2 weeks, 2 days ago
28 stars 3 fork 3 watcher
Born at : June 30, 2023, 4:44 a.m. This repo has been linked 9 different CVEs too.
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H4lo/awesome-IoT-security-article

Collect some iot-related security articles, including vulnerability analysis, security conferences and papers, etc.

iot-security

Updated: 2 weeks, 6 days ago
235 stars 27 fork 27 watcher
Born at : Dec. 6, 2022, 1:11 p.m. This repo has been linked 46 different CVEs too.
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tin-z/Stuff_and_POCs

Containing vulnerabilities I've discovered and maybe CVE

cve vulnerability-research

Python C++ C Shell Go

Updated: 4 months, 2 weeks ago
17 stars 2 fork 2 watcher
Born at : March 21, 2022, 2:32 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-35029 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-35029 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jul. 08, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml No Types Assigned https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml Vendor Advisory
    Added CWE NIST CWE-287
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg40_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg40w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg60_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg60w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg300_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg300:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg1000_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg1000:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg2000_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg2000:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg20:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg20w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg50_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg50:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 4.64 OR cpe:2.3:h:zyxel:usg200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp100w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp100w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp500_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp500:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp700_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp700:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_atp800_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_atp800:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_vpn50:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_vpn100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_vpn300:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg2200-vpn_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_110_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_110:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_310_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_310:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall_1100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (including) 5.01 OR cpe:2.3:h:zyxel:zywall_1100:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-35029 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-35029 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.70 }} -0.02%

score

0.79738

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: