CVE-2021-35036 Vulnerability Analysis & Exploit Details

CVE-2021-35036
Vulnerability Scoring

6.5
/10
High Risk

If left unpatched, CVE-2021-35036 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-35036 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:11 UTC
Originally published on: 🕖 01 Mar 2022, 07:15 UTC

Time between publication and last update: 995 days

CVSS Release: version 3

CVSS3 Source

security@zyxel.com.tw

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-35036 Vulnerability Summary

CVE-2021-35036: A cleartext storage of information vulnerability in the Zyxel VMG3625-T50B firmware version V5.50(ABTL.0)b2k could allow an authenticated attacker to obtain sensitive information from the configuration file.

Assessing the Risk of CVE-2021-35036

Access Complexity Graph

The exploitability of CVE-2021-35036 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-35036

CVE-2021-35036 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-35036, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-35036, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2021-35036 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2021-35036 poses no threat to data integrity.
  • Availability: None
    CVE-2021-35036 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.064% (probability of exploit)

EPSS Percentile: 30.95% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 69.05% of others.

CVE-2021-35036 References

External References

CWE Common Weakness Enumeration

CWE-312

CAPEC Common Attack Pattern Enumeration and Classification

  • Retrieve Embedded Sensitive Data CAPEC-37 An attacker examines a target system to find sensitive data that has been embedded within it. This information can reveal confidential contents, such as account numbers or individual keys/credentials that can be used as an intermediate step in a larger attack.

Vulnerable Configurations

  • cpe:2.3:o:zyxel:ax7501-b0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ax7501-b0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ax7501-b0_firmware:5.17\(abpc.1\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ax7501-b0_firmware:5.17\(abpc.1\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:ax7501-b0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:ax7501-b0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:dx3301-t0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:dx3301-t0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:dx3301-t0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:dx3301-t0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:dx5401-b0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:dx5401-b0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:dx5401-b0_firmware:5.17\(abyo.1\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:dx5401-b0_firmware:5.17\(abyo.1\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:dx5401-b0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:dx5401-b0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg3525-t50b_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:emg3525-t50b_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg3525-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:america:*:*:*
    cpe:2.3:o:zyxel:emg3525-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:america:*:*:*
  • cpe:2.3:o:zyxel:emg3525-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:emea:*:*:*
    cpe:2.3:o:zyxel:emg3525-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:emea:*:*:*
  • cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg5523-t50b_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:emg5523-t50b_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg5523-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:america:*:*:*
    cpe:2.3:o:zyxel:emg5523-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:america:*:*:*
  • cpe:2.3:o:zyxel:emg5523-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:emea:*:*:*
    cpe:2.3:o:zyxel:emg5523-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:emea:*:*:*
  • cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg5723-t50k_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:emg5723-t50k_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg5723-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:emg5723-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:emg5723-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:emg5723-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:emg5723-t50k:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:emg5723-t50k:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ep240p_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ep240p_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ep240p_firmware:5.40\(abh.0\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ep240p_firmware:5.40\(abh.0\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:ep240p:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:ep240p:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ex5401-b0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ex5401-b0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ex5401-b0_firmware:5.17\(abyo.1\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ex5401-b0_firmware:5.17\(abyo.1\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:ex5401-b0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:ex5401-b0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ex5501-b0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ex5501-b0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:ex5501-b0_firmware:5.17\(abry.2\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:ex5501-b0_firmware:5.17\(abry.2\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:ex5501-b0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:ex5501-b0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte3301-plus_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte3301-plus_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte3301-plus:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte3301-plus:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte5388-m804_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte5388-m804_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte5388-m804:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte5388-m804:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte5388-s905:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte5388-s905:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte5398-m904_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte5398-m904_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte5398-m904:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte5398-m904:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte7240-m403_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte7240-m403_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7240-m403:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7240-m403:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte7461-m602_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte7461-m602_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7461-m602:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7461-m602:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7480-m804:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7480-m804:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte7480-s905_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte7480-s905_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7480-s905:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7480-s905:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:lte7485-s905_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:lte7485-s905_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7485-s905:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7485-s905:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:lte7490-m804:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:lte7490-m804:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:nr5101:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:nr5101:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:nr7101:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:nr7101:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:nr7102:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:nr7102:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pm7300-t0_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pm7300-t0_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pm7300-t0_firmware:5.42\(abyy.2.2\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pm7300-t0_firmware:5.42\(abyy.2.2\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:pm7300-t0:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:pm7300-t0:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pmg5317-t20b_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pmg5317-t20b_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:pmg5317-t20b:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:pmg5317-t20b:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pmg5617-t20b2_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pmg5617-t20b2_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:pmg5617-t20b2:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:pmg5617-t20b2:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pmg5617ga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pmg5617ga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:pmg5617ga:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:pmg5617ga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:pmg5622ga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:pmg5622ga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:pmg5622ga:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:pmg5622ga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3625-t50b_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3625-t50b_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3625-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3625-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3625-t50b_firmware:5.50\(abpm.9.2\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3625-t50b_firmware:5.50\(abpm.9.2\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:vmg3625-t50b:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:vmg3625-t50b:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3927-t50k_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3927-t50k_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3927-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3927-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg3927-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg3927-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:vmg3927-t50k:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:vmg3927-t50k:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg8623-t50b_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg8623-t50b_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg8623-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg8623-t50b_firmware:5.50\(abpm.6\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:vmg8623-t50b:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:vmg8623-t50b:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg8825-t50k_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg8825-t50k_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg8825-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg8825-t50k_firmware:5.50\(abom.7\)c0:*:*:*:*:*:*:*
  • cpe:2.3:o:zyxel:vmg8825-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
    cpe:2.3:o:zyxel:vmg8825-t50k_firmware:5.50\(abom.8.4\)c0:*:*:*:*:*:*:*
  • cpe:2.3:h:zyxel:vmg8825-t50k:-:*:*:*:*:*:*:*
    cpe:2.3:h:zyxel:vmg8825-t50k:-:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-35036: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2025-3103 – The CLEVER - HTML5 Radio Player With History - Shoutcast and Icecast - Elementor Widget Addon plugin for WordPress is vulnerable to arbitrary file ...
  • CVE-2025-3275 – The Themesflat Addons For Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the TF E Slider widget in all versions up...
  • CVE-2025-1457 – The Element Pack Addons for Elementor – Free Templates and Widgets for Your WordPress Websites plugin for WordPress is vulnerable to Stored Cross-S...
  • CVE-2025-1093 – The AIHub theme for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the generate_image function in all ver...
  • CVE-2025-3284 – The User Registration & Membership – Custom Registration Form, Login Form, and User Profile plugin for WordPress is vulnerable to Cross-Site Reques...