CVE-2021-35036 Explained : Impact and Mitigation

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.

Understanding CVE-2021-35036

This vulnerability, identified as CVE-2021-35036, affects Zyxel's VMG3625-T50B firmware version V5.50(ABTL.0)b2k, potentially exposing sensitive data to attackers.

What is CVE-2021-35036?

CVE-2021-35036 is a cleartext storage of information vulnerability in the Zyxel VMG3625-T50B firmware version V5.50(ABTL.0)b2k. It allows authenticated attackers to retrieve sensitive information from the configuration file.

The Impact of CVE-2021-35036

With a CVSSv3 base score of 6.5, this medium-severity vulnerability could result in high confidentiality impact, enabling attackers to access critical data stored in the configuration file.

Technical Details of CVE-2021-35036

This section provides more in-depth technical details about the CVE-2021-35036 vulnerability.

Vulnerability Description

The vulnerability involves cleartext storage of sensitive information in the affected Zyxel VMG3625-T50B firmware version. Attackers with authentication can exploit this weakness to access valuable data.

Affected Systems and Versions

Zyxel's VMG3625-T50B firmware version V5.50(ABTL.0)b2k is specifically impacted by this vulnerability. Users with this version should take immediate action to secure their systems.

Exploitation Mechanism

The vulnerability can be exploited by authenticated attackers over a network, with low complexity. No user interaction is required, and the attacker needs low privileges to exploit this flaw.

Mitigation and Prevention

To safeguard systems from CVE-2021-35036, users and administrators should follow these mitigation strategies.

Immediate Steps to Take

Update Zyxel VMG3625-T50B firmware to a secure version that addresses the cleartext storage vulnerability.
Monitor network traffic for any suspicious activities that could indicate an ongoing exploitation attempt.

Long-Term Security Practices

Regularly check for security advisories from Zyxel and apply security patches promptly.
Utilize strong authentication mechanisms and access controls to limit exposure to potential attackers.

Patching and Updates

Zyxel may release patches or updates to fix CVE-2021-35036. It is crucial to stay informed about these releases and apply them as soon as they are available to enhance the security posture of the affected systems.