6.1
MEDIUM
CVE-2023-35139
Zyxel ATP/USG/USG20/VPN CGI Stored XSS
Description

A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs.

INFO

Published Date :

Nov. 28, 2023, 2:15 a.m.

Last Modified :

Nov. 21, 2024, 8:08 a.m.

Remotely Exploitable :

Yes !

Impact Score :

2.7

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2023-35139 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 zld
2 Zyxel usg_20w-vpn_firmware
3 Zyxel usg_flex_100_firmware
4 Zyxel vpn100_firmware
5 Zyxel atp100_firmware
6 Zyxel atp100
7 Zyxel atp200
8 Zyxel atp500
9 Zyxel atp100w
10 Zyxel atp700
11 Zyxel atp800
12 Zyxel usg_flex_100
13 Zyxel usg_flex_50
14 Zyxel usg_flex_200
15 Zyxel usg_flex_500
16 Zyxel usg_flex_700
17 Zyxel usg_flex_100w
18 Zyxel usg_flex_50w
19 Zyxel usg_20w-vpn
20 Zyxel vpn100
21 Zyxel vpn50
22 Zyxel vpn300
23 Zyxel vpn1000
24 Zyxel vpn50w
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-2023-35139.

URL Resource
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps 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).

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

The following list is the news that have been mention CVE-2023-35139 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-35139 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/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps
  • CVE Modified by [email protected]

    May. 14, 2024

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

    Dec. 04, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps No Types Assigned https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps Vendor Advisory
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (including) 5.37 OR cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* versions from (including) 5.00 up to (including) 5.37 OR cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (including) 5.37 OR cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:vpn50w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* versions from (including) 5.00 up to (including) 5.37 OR cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:* cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*
  • CVE Received by [email protected]

    Nov. 28, 2023

    Action Type Old Value New Value
    Added Description A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs.
    Added Reference Zyxel Corporation https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps [No types assigned]
    Added CWE Zyxel Corporation CWE-79
    Added CVSS V3.1 Zyxel Corporation AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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-2023-35139 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-2023-35139 weaknesses.

Exploit Prediction

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

0.06 }} 0.01%

score

0.28908

percentile

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