CVE-2026-79393 in IP Camera
Summary
by MITRE • 09/11/2026
A heap-based buffer overflow vulnerability in the WS-Addressing Action transformation function in the Sofia IPC daemon in Xiongmai IP Camera XM530 firmware HMT.CM2005-v220608.1837 and earlier allows remote unauthenticated attackers to cause a denial of service or potentially execute arbitrary code via a crafted SOAP request containing a wsa5:Action string exceeding 128 bytes.
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Analysis
by VulDB Data Team • 09/11/2026
The vulnerability identified in the Sofia IPC daemon within Xiongmai IP Camera firmware versions HMT.CM2005-v220608.1837 and earlier represents a critical security flaw rooted in improper memory management during network protocol processing. Specifically, this heap-based buffer overflow occurs within the WS-Addressing Action transformation function. The Sofia IPC daemon is responsible for handling inter-process communication and various web service protocols on embedded devices such as IP cameras. When the system receives a SOAP request containing a wsa5:Action string that exceeds 128 bytes in length, the application fails to perform adequate bounds checking before copying this data into a fixed-size buffer allocated on the heap. This lack of validation allows an attacker to write beyond the intended boundaries of the memory allocation, corrupting adjacent heap metadata or other critical data structures stored nearby.
From a technical perspective, this flaw aligns with CWE-122, which describes a heap-based buffer overflow where input is not sufficiently validated before being copied into a destination buffer on the heap. The exploitation mechanism relies on crafting a malicious SOAP request that triggers the vulnerable transformation function. By carefully constructing the payload to exceed the 128-byte limit and potentially including specific shellcode or return address overwrites, an unauthenticated remote attacker can manipulate the program's control flow. This manipulation can lead to arbitrary code execution with the privileges of the affected service, which is often root-level access on embedded Linux systems. Alternatively, if precise exploitation for code execution is not feasible, the memory corruption can cause immediate application crashes or instability, resulting in a denial of service condition that disrupts camera functionality and network availability.
The operational impact of this vulnerability is severe due to its remote and unauthenticated nature. Attackers do not need valid credentials to exploit this flaw, making it highly attractive for automated scanning campaigns and widespread attacks against IoT infrastructure. Successful exploitation could allow an adversary to gain full control over the IP camera, potentially using it as a pivot point for further network intrusion, launching distributed denial-of-service (DDoS) attacks via botnets like Mirai, or accessing sensitive video feeds without authorization. This aligns with MITRE ATT&CK techniques related to initial access and privilege escalation within IoT environments, particularly those involving exploitation of remote services that lack proper input validation.
Mitigation strategies must focus on both immediate remediation and long-term security hardening. The primary solution is for the vendor to release a firmware update that patches the Sofia IPC daemon by implementing strict length checks before processing the wsa5:Action string or using safer memory handling functions that prevent buffer overflows. In the absence of an immediate patch, network-level mitigations should be employed. This includes restricting access to the SOAP interface through firewall rules to only trusted IP addresses and disabling unnecessary web services if they are not required for operation. Additionally, deploying intrusion detection systems configured with signatures for this specific vulnerability can help identify and block malicious traffic attempting to exploit the heap overflow before it causes damage or unauthorized access.