CVE-2025-23123: UniFi Protect Cameras RCE Vulnerability

CVE-2025-23123 Overview

CVE-2025-23123 is a critical heap buffer overflow vulnerability affecting UniFi Protect Cameras firmware. A malicious actor with access to the management network could exploit this vulnerability to achieve remote code execution (RCE) on affected camera devices. This flaw is classified as CWE-122 (Heap-based Buffer Overflow), representing a severe memory corruption issue in the firmware's handling of data buffers.

Critical Impact

This vulnerability enables complete device compromise through remote code execution, potentially allowing attackers to take full control of affected cameras, intercept video feeds, pivot to other network resources, or disable surveillance capabilities entirely.

Affected Products

• UniFi Protect Cameras Version 4.75.43 and earlier
• Ubiquiti UniFi Protect Camera firmware (all models running vulnerable versions)

Discovery Timeline

• 2025-05-19 - CVE CVE-2025-23123 published to NVD
• 2025-05-19 - Last updated in NVD database

Technical Details for CVE-2025-23123

Vulnerability Analysis

This vulnerability stems from improper memory handling in the UniFi Protect Camera firmware, resulting in a heap-based buffer overflow condition. When exploited, the vulnerability allows an attacker with network access to the camera's management interface to corrupt heap memory structures, potentially leading to arbitrary code execution with full device privileges.

The heap buffer overflow occurs when the firmware processes specially crafted input without proper bounds checking. Since the cameras operate as network-accessible IoT devices, this creates a significant attack surface for adversaries who have gained access to the management network segment.

Successful exploitation grants attackers complete control over the affected camera hardware, enabling them to intercept or manipulate video streams, disable recording functionality, use the compromised device as a foothold for lateral movement within the network, or deploy persistent malware on the embedded system.

Root Cause

The vulnerability is caused by insufficient validation of input data lengths before copying into heap-allocated memory buffers. The firmware fails to properly verify boundary conditions, allowing an attacker to write beyond the allocated buffer space. This heap-based buffer overflow (CWE-122) occurs when user-controlled data exceeds the expected buffer size, corrupting adjacent heap metadata or other heap objects.

Attack Vector

Exploitation requires network-level access to the camera's management interface. An attacker positioned on the management network can send maliciously crafted requests to the vulnerable camera firmware. The attack can be conducted remotely without requiring any user interaction or prior authentication, as indicated by the network-based attack vector with no privilege requirements.

The exploitation mechanism involves:

1. Identifying a vulnerable UniFi Protect Camera on the management network
2. Crafting a malicious payload that triggers the heap buffer overflow condition
3. Sending the payload to the camera's network interface
4. Overwriting heap memory to achieve code execution
5. Executing arbitrary commands on the embedded camera system

For technical details on the vulnerability mechanism, refer to the UI Community Security Advisory.

Detection Methods for CVE-2025-23123

Indicators of Compromise

• Unexpected outbound network connections from camera devices to unknown IP addresses
• Abnormal process activity or memory consumption on camera devices
• Unauthorized changes to camera configuration or firmware
• Unexpected reboots or stability issues with camera devices
• Anomalous traffic patterns on the management network segment

Detection Strategies

• Monitor management network traffic for anomalous requests to camera devices
• Implement network segmentation monitoring to detect unauthorized access attempts to camera management interfaces
• Deploy intrusion detection systems (IDS) with signatures for heap overflow exploitation patterns
• Enable firmware integrity verification to detect unauthorized modifications

Monitoring Recommendations

• Implement continuous monitoring of camera device firmware versions across the environment
• Deploy network traffic analysis on management network segments to identify exploitation attempts
• Configure alerting for any unauthorized access to camera management interfaces
• Establish baseline behavior for camera network communications and alert on deviations

How to Mitigate CVE-2025-23123

Immediate Actions Required

• Update all UniFi Protect Cameras to firmware versions newer than 4.75.43 immediately
• Audit and restrict network access to camera management interfaces to authorized systems only
• Implement strict network segmentation to isolate camera management networks from general network traffic
• Review logs for any indicators of compromise or exploitation attempts

Patch Information

Ubiquiti has released updated firmware to address this vulnerability. Organizations should update to the latest available firmware version beyond 4.75.43. Refer to the UI Community Security Advisory for detailed patch information and firmware download links.

Workarounds

• Implement strict firewall rules to limit access to camera management interfaces to only authorized IP addresses
• Place camera management networks behind a VPN with strong authentication requirements
• Deploy network access control (NAC) to prevent unauthorized devices from accessing management network segments
• Consider temporarily disconnecting vulnerable cameras from the network until patches can be applied in high-risk environments

# Example: Restrict management network access using firewall rules
# Allow only specific management hosts to access camera interfaces
iptables -A INPUT -s 10.0.0.0/24 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP