CVE-2025-55322: Microsoft Omniparser RCE Vulnerability

CVE-2025-55322 Overview

CVE-2025-55322 is a network-based remote code execution vulnerability affecting Microsoft OmniParser. The vulnerability stems from the application binding to an unrestricted IP address, which allows an unauthorized attacker to execute arbitrary code over a network without requiring authentication or user interaction.

Critical Impact

Unauthorized attackers can exploit this vulnerability remotely to execute code, potentially compromising system confidentiality, integrity, and availability without any prior authentication.

Affected Products

• Microsoft OmniParser (all versions prior to patch)

Discovery Timeline

• 2025-09-24 - CVE-2025-55322 published to NVD
• 2025-10-01 - Last updated in NVD database

Technical Details for CVE-2025-55322

Vulnerability Analysis

This vulnerability is classified under CWE-1327 (Binding to an Unrestricted IP Address). The core issue lies in how Microsoft OmniParser configures network listeners. When an application binds to 0.0.0.0 or an equivalent unrestricted address, it accepts connections on all available network interfaces rather than restricting access to specific trusted interfaces such as localhost or internal network addresses.

This design flaw exposes the application to network-based attacks where remote, unauthenticated attackers can interact with services that should only be accessible locally or within a trusted network perimeter. The vulnerability enables code execution capabilities, meaning an attacker successfully exploiting this flaw can run arbitrary commands or code within the context of the vulnerable application.

Root Cause

The root cause is improper network binding configuration in Microsoft OmniParser. Instead of binding to a specific, restricted IP address (such as 127.0.0.1 for local-only access), the application binds to an unrestricted address, making the service accessible from any network interface. This violates the principle of least privilege for network exposure and creates an unnecessary attack surface.

Attack Vector

The attack vector is network-based, requiring no authentication and no user interaction. An attacker with network access to the vulnerable OmniParser instance can send malicious requests directly to the exposed service. The attack can be executed remotely from anywhere on the network that can reach the vulnerable host, making this particularly dangerous in environments where the affected system is accessible from untrusted networks or the internet.

The exploitation flow typically involves:

1. Attacker identifies a system running vulnerable Microsoft OmniParser
2. Attacker connects to the exposed service on the unrestricted network interface
3. Attacker sends crafted requests that result in code execution on the target system

Detection Methods for CVE-2025-55322

Indicators of Compromise

• Unexpected network connections to OmniParser services from external or untrusted IP addresses
• Anomalous process spawning or command execution originating from OmniParser processes
• Network traffic to OmniParser ports from non-standard source addresses

Detection Strategies

• Monitor network connections to OmniParser services and alert on connections from external or unexpected IP ranges
• Implement network segmentation rules that detect attempted access to OmniParser from untrusted network zones
• Deploy endpoint detection rules to identify suspicious child processes spawned by OmniParser

Monitoring Recommendations

• Configure firewall logging to capture all connection attempts to OmniParser service ports
• Enable application-level logging within OmniParser to track incoming requests and their source addresses
• Utilize SentinelOne's behavioral AI to detect anomalous execution patterns associated with OmniParser processes

How to Mitigate CVE-2025-55322

Immediate Actions Required

• Apply the latest security patch from Microsoft for OmniParser immediately
• Restrict network access to OmniParser services using firewall rules to allow only trusted IP addresses
• Place OmniParser instances behind a network segmentation boundary that prevents access from untrusted networks

Patch Information

Microsoft has released a security update addressing this vulnerability. Detailed patch information is available in the Microsoft Security Update for CVE-2025-55322. Organizations should prioritize applying this update to all affected systems.

Workarounds

• Configure host-based firewall rules to restrict access to OmniParser ports to localhost or specific trusted IP addresses only
• Deploy network-level access controls (ACLs) on network devices to block external access to affected services
• If OmniParser is not required to accept remote connections, configure it to bind only to 127.0.0.1

# Example firewall rule to restrict access to OmniParser service (port example)
# Allow only localhost access
iptables -A INPUT -p tcp --dport <OMNIPARSER_PORT> -s 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport <OMNIPARSER_PORT> -j DROP