CVE-2025-68721: Axigen Mail Server Auth Bypass Flaw

CVE-2025-68721 Overview

CVE-2025-68721 is an improper access control vulnerability affecting Axigen Mail Server versions prior to 10.5.57. The vulnerability exists in the WebAdmin interface, where a delegated admin account with zero permissions can bypass access control checks and gain unauthorized access to the SSL Certificates management endpoint (page=sslcerts). This allows an attacker to view, download, upload, and delete SSL certificate files, despite lacking the necessary privileges to access the Security & Filtering section.

Critical Impact

Exploitation allows attackers with minimal delegated admin privileges to completely compromise SSL certificate management, potentially enabling man-in-the-middle attacks, service impersonation, and disruption of encrypted communications.

Affected Products

• Axigen Mail Server versions before 10.5.57
• Axigen WebAdmin interface with delegated admin accounts
• Systems with SSL/TLS certificate management enabled

Discovery Timeline

• 2026-02-05 - CVE-2025-68721 published to NVD
• 2026-02-05 - Last updated in NVD database

Technical Details for CVE-2025-68721

Vulnerability Analysis

This vulnerability stems from improper access control (CWE-284) within the Axigen WebAdmin interface. The authorization mechanism fails to properly validate delegated admin permissions when accessing the SSL Certificates management endpoint. Even when a delegated admin account is configured with zero permissions, the access control checks for the page=sslcerts endpoint do not enforce the expected restrictions.

The vulnerability is exploitable over the network without requiring user interaction. An authenticated attacker with a low-privileged delegated admin account can directly access the SSL certificate management functionality, bypassing the intended permission model. This represents a significant authorization bypass that could lead to complete compromise of the mail server's SSL/TLS infrastructure.

Root Cause

The root cause lies in insufficient authorization validation for the SSL Certificates management endpoint within the WebAdmin interface. The application fails to verify whether the delegated admin account possesses the required privileges to access the Security & Filtering section before granting access to the sslcerts page. This missing or improperly implemented access control check allows unauthorized users to bypass permission restrictions.

Attack Vector

The attack vector requires network access to the Axigen WebAdmin interface. An attacker must first obtain credentials for a delegated admin account, which may have been intentionally configured with zero permissions. Once authenticated, the attacker can directly navigate to the SSL Certificates management endpoint by accessing the page=sslcerts parameter. The application processes the request without validating the account's actual permission level, granting full access to:

• View existing SSL certificates and their configurations
• Download private keys and certificate files
• Upload malicious or attacker-controlled certificates
• Delete legitimate certificates, disrupting secure communications

The attack does not require any special tools—only a web browser and knowledge of the vulnerable endpoint URL structure.

Detection Methods for CVE-2025-68721

Indicators of Compromise

• Unexpected access logs showing delegated admin accounts accessing /admin/ endpoints with page=sslcerts parameter
• Changes to SSL certificates without corresponding authorized administrative actions
• Certificate files modified, downloaded, or deleted by accounts lacking Security & Filtering permissions
• Anomalous authentication patterns from delegated admin accounts followed by certificate management activity

Detection Strategies

• Monitor WebAdmin access logs for requests containing page=sslcerts from accounts without appropriate privileges
• Implement audit logging for all SSL certificate management operations and correlate with user permission levels
• Deploy web application firewall rules to alert on access patterns indicative of authorization bypass attempts
• Review delegated admin account activity regularly for unauthorized administrative actions

Monitoring Recommendations

• Enable verbose logging on the Axigen WebAdmin interface to capture all administrative actions
• Configure SIEM alerts for access control violations or privilege escalation indicators
• Establish baseline behavior for delegated admin accounts and alert on deviations
• Monitor file integrity of SSL certificate directories for unauthorized modifications

How to Mitigate CVE-2025-68721

Immediate Actions Required

• Upgrade Axigen Mail Server to version 10.5.57 or later immediately
• Audit all delegated admin accounts and review their current permission configurations
• Review access logs for any historical unauthorized access to the SSL Certificates management endpoint
• Consider temporarily restricting WebAdmin access to trusted networks until patching is complete

Patch Information

Axigen has released version 10.5.57 which addresses this improper access control vulnerability. Organizations should download the latest version from the Axigen Mail Server Download page and apply the update following their standard change management procedures. Detailed information about the vulnerability and remediation is available in the Axigen CVE-2025-68721 Advisory.

Workarounds

• Restrict network access to the WebAdmin interface using firewall rules to limit exposure to trusted IP addresses only
• Remove or disable all delegated admin accounts until patching can be completed
• Implement additional authentication controls such as VPN requirements for administrative access
• Enable multi-factor authentication for all administrative accounts where supported

# Example: Restrict WebAdmin access via iptables (adjust interface and IPs as needed)
# Allow only trusted management network to access WebAdmin port
iptables -A INPUT -p tcp --dport 9000 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9000 -j DROP