CVE-2025-10159: Sophos AP6 Auth Bypass Vulnerability

CVE-2025-10159 Overview

CVE-2025-10159 is a critical authentication bypass vulnerability affecting Sophos AP6 Series Wireless Access Points running firmware versions older than 1.7.2563 (MR7). This vulnerability enables remote attackers to circumvent authentication mechanisms and gain unauthorized administrative privileges on affected devices, potentially compromising the entire wireless network infrastructure.

Critical Impact

Remote attackers can exploit this authentication bypass to gain full administrative control over Sophos AP6 wireless access points without valid credentials, enabling network-wide compromise and unauthorized configuration changes.

Affected Products

• Sophos AP6 Series Wireless Access Points with firmware versions prior to 1.7.2563 (MR7)

Discovery Timeline

• 2025-09-09 - CVE-2025-10159 published to NVD
• 2025-09-11 - Last updated in NVD database

Technical Details for CVE-2025-10159

Vulnerability Analysis

This authentication bypass vulnerability is classified under CWE-620 (Unverified Password Change), indicating a flaw in how the affected Sophos AP6 Series devices handle authentication processes. The vulnerability allows unauthenticated remote attackers to bypass the standard authentication workflow and obtain administrative privileges on vulnerable access points.

The network-accessible nature of this vulnerability means that any attacker with network access to the management interface of the affected device can potentially exploit this flaw without requiring any prior authentication or user interaction. Successful exploitation grants the attacker complete administrative control over the access point, enabling them to modify configurations, intercept network traffic, pivot to other network segments, or deploy malicious configurations.

Root Cause

The root cause of CVE-2025-10159 stems from improper implementation of authentication controls within the firmware of Sophos AP6 Series devices. Specifically, the vulnerability relates to CWE-620, which typically involves insufficient verification during credential management operations. This weakness allows attackers to manipulate authentication requests or exploit logic flaws in the authentication flow to gain elevated privileges without presenting valid credentials.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no privileges and no user interaction. An attacker can exploit this vulnerability remotely by targeting the management interface of vulnerable Sophos AP6 access points. The attack requires only network connectivity to the target device's management interface.

The exploitation mechanism involves sending specially crafted requests to the access point's authentication endpoints, allowing the attacker to bypass credential verification and establish an administrative session. Once administrative access is obtained, the attacker has full control over the device configuration, wireless network settings, and can potentially use the compromised access point as a foothold for further network intrusion.

Detection Methods for CVE-2025-10159

Indicators of Compromise

• Unexpected administrative sessions or logins on AP6 devices without corresponding legitimate user activity
• Configuration changes to access point settings not initiated by authorized administrators
• Unusual network traffic patterns to or from the AP6 management interface
• Authentication logs showing successful admin logins without proper credential exchange
• New or modified wireless network profiles created without authorization

Detection Strategies

• Monitor authentication logs on Sophos AP6 devices for anomalous login patterns or authentication bypasses
• Implement network traffic analysis to detect unusual connections to AP6 management interfaces
• Deploy intrusion detection rules to identify exploitation attempts targeting authentication endpoints
• Audit access point configurations regularly for unauthorized changes
• Enable comprehensive logging on all network devices and centralize log collection

Monitoring Recommendations

• Establish baselines for normal administrative access patterns and alert on deviations
• Monitor for firmware version discrepancies across AP6 deployments to identify unpatched devices
• Implement network segmentation to isolate management interfaces from general network traffic
• Set up automated alerts for configuration changes on wireless access points
• Review administrative session logs daily for signs of unauthorized access

How to Mitigate CVE-2025-10159

Immediate Actions Required

• Upgrade all Sophos AP6 Series Wireless Access Points to firmware version 1.7.2563 (MR7) or later immediately
• Restrict network access to AP6 management interfaces to authorized administrative networks only
• Review all access point configurations for unauthorized changes since deployment
• Implement strong network segmentation to isolate wireless management infrastructure
• Enable enhanced logging and monitoring on all AP6 devices

Patch Information

Sophos has released firmware version 1.7.2563 (MR7) which addresses this authentication bypass vulnerability. Organizations should prioritize patching all affected AP6 Series devices. For detailed patch instructions and firmware downloads, refer to the Sophos Security Advisory SA-20250909.

Workarounds

• Restrict access to the AP6 management interface using firewall rules to allow only trusted administrative IP addresses
• Place AP6 management interfaces on a dedicated VLAN isolated from general network traffic
• Implement VPN requirements for all remote administrative access to wireless infrastructure
• Monitor and audit all access attempts to AP6 devices until patching is complete
• Consider temporarily disabling web-based management interfaces if alternative management methods are available

# Network segmentation example - restrict management interface access
# Configure firewall to allow only trusted admin IPs to access AP management
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP