CVE-2025-62691: MaLion Security Point Buffer Overflow

CVE-2025-62691 Overview

CVE-2025-62691 is a critical stack-based buffer overflow vulnerability discovered in the Security Point (Windows) component of MaLion and MaLionCloud endpoint management software. The vulnerability exists in the HTTP header processing functionality, where specially crafted HTTP requests can trigger a buffer overflow condition. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary code with SYSTEM privileges on affected Windows systems, resulting in complete system compromise.

Critical Impact

Remote unauthenticated attackers can achieve arbitrary code execution with SYSTEM privileges by sending specially crafted HTTP requests to vulnerable MaLion and MaLionCloud Security Point installations.

Affected Products

• MaLion Security Point (Windows)
• MaLionCloud Security Point (Windows)

Discovery Timeline

• 2025-11-25 - CVE-2025-62691 published to NVD
• 2025-11-25 - Last updated in NVD database

Technical Details for CVE-2025-62691

Vulnerability Analysis

This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow), a memory corruption flaw that occurs when data written to a stack buffer exceeds its allocated size. In the context of MaLion and MaLionCloud Security Point, the vulnerable code improperly handles HTTP header data, failing to adequately validate the length of incoming header values before copying them to a fixed-size stack buffer.

When the Security Point component processes HTTP requests, it allocates stack memory for parsing header information. An attacker can craft an HTTP request containing oversized header values that exceed the buffer's capacity. This overflow condition allows the attacker to overwrite adjacent stack memory, including the return address, enabling control flow hijacking and ultimately arbitrary code execution.

The network-accessible nature of this vulnerability combined with the lack of authentication requirements makes it particularly severe. Successful exploitation grants the attacker SYSTEM-level privileges, the highest privilege level on Windows systems, providing complete control over the compromised endpoint.

Root Cause

The root cause of CVE-2025-62691 is inadequate bounds checking in the HTTP header parsing routine within the Security Point component. The code fails to properly validate the length of HTTP header values before copying them into a fixed-size stack buffer. This allows an attacker to supply header values exceeding the buffer's capacity, leading to stack memory corruption.

Attack Vector

The attack vector for this vulnerability is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying a network-accessible MaLion or MaLionCloud Security Point installation
2. Crafting a malicious HTTP request with oversized header values designed to overflow the stack buffer
3. Sending the crafted request to the target system
4. Overwriting the return address on the stack with an attacker-controlled value
5. Redirecting execution flow to injected shellcode or ROP gadgets to achieve arbitrary code execution with SYSTEM privileges

The exploitation process leverages the oversized HTTP header to corrupt the stack, overwrite critical control data, and hijack program execution. Since the Security Point service runs with elevated privileges, successful exploitation immediately grants SYSTEM-level access to the attacker.

Detection Methods for CVE-2025-62691

Indicators of Compromise

• Unusual network traffic patterns targeting MaLion or MaLionCloud Security Point services with abnormally large HTTP headers
• Unexpected process spawning or child processes from the Security Point service executable
• Suspicious SYSTEM-level processes initiated after HTTP requests to Security Point endpoints
• Memory access violations or crash dumps from the Security Point component

Detection Strategies

• Deploy network intrusion detection rules to identify HTTP requests with abnormally large header values targeting Security Point services
• Monitor for unusual process creation events originating from MaLion or MaLionCloud Security Point processes
• Implement endpoint detection rules to identify stack-based buffer overflow exploitation patterns
• Enable Windows Event Logging for Application Crashes and monitor for Security Point crash events

Monitoring Recommendations

• Establish baseline network traffic patterns for Security Point services and alert on deviations
• Configure SIEM rules to correlate HTTP anomalies with subsequent privilege escalation indicators
• Monitor for post-exploitation behaviors such as credential dumping, lateral movement, or persistence mechanisms following Security Point service anomalies
• Enable SentinelOne behavioral AI to detect memory corruption exploitation techniques

How to Mitigate CVE-2025-62691

Immediate Actions Required

• Review the JVN Security Advisory for official guidance and patch information
• Consult the Intercom Security Information page for vendor-specific remediation steps
• Implement network segmentation to restrict access to Security Point services from untrusted networks
• Deploy SentinelOne endpoint protection to detect and block exploitation attempts targeting memory corruption vulnerabilities

Patch Information

Organizations should immediately review the official security advisories from Intercom and apply any available patches. The JVN Security Advisory and Intercom Security Information pages provide official guidance on remediation. Prioritize patching all MaLion and MaLionCloud Security Point (Windows) installations given the critical severity and remote exploitation potential of this vulnerability.

Workarounds

• Restrict network access to Security Point services using firewall rules to allow connections only from trusted management systems
• Consider deploying a web application firewall (WAF) or reverse proxy in front of Security Point services to filter oversized HTTP headers
• Temporarily disable the vulnerable Security Point component if it is not critical to operations until a patch can be applied
• Enable additional monitoring and alerting on Security Point service processes to detect potential exploitation attempts