CVE-2025-11323 identifies a buffer overflow vulnerability in the UTT 1250GW device firmware versions up to v2v3.2.2-200710. The flaw exists in the strcpy function within the /goform/formUserStatusRemark endpoint, where the Username argument is improperly handled, allowing an attacker to overflow the buffer. This vulnerability can be exploited remotely without authentication or user interaction, making it highly accessible to attackers. The overflow can lead to arbitrary code execution, enabling attackers to compromise device confidentiality, integrity, and availability. The vulnerability was responsibly disclosed to the vendor, who has not responded or issued patches, and exploit details have been publicly disclosed, increasing the risk of exploitation. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low complexity, no authentication, and high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported yet, but the public disclosure and lack of patching make this a critical concern for affected users. The vulnerability primarily affects embedded systems running the specified firmware version, commonly used in telecommunications or network infrastructure.

For European organizations, this vulnerability poses a significant risk, especially those relying on UTT 1250GW devices in telecommunications, network infrastructure, or critical industrial environments. Successful exploitation could lead to full device compromise, allowing attackers to intercept or manipulate sensitive communications, disrupt network services, or pivot to internal networks. This could result in data breaches, service outages, or espionage activities. The lack of vendor response and patch availability increases exposure time, elevating the threat level. Organizations in sectors such as telecom providers, government agencies, and critical infrastructure operators are particularly vulnerable. The remote, unauthenticated nature of the exploit means attackers can target devices over the internet or internal networks without user interaction, increasing the attack surface. The potential for widespread disruption and data compromise makes this a high-impact threat for Europe’s digital ecosystem.

Given the absence of vendor patches, European organizations should implement immediate compensating controls. First, restrict network access to the vulnerable device’s management interfaces by applying strict firewall rules and network segmentation, limiting exposure to trusted administrative networks only. Disable or block access to the /goform/formUserStatusRemark endpoint if possible, or implement web application firewalls (WAFs) with custom rules to detect and block malformed requests targeting the strcpy vulnerability. Monitor network traffic and device logs for unusual activity or exploitation attempts, using intrusion detection systems (IDS) tuned for buffer overflow signatures. Consider replacing or upgrading affected devices to newer models or firmware versions once available. Additionally, conduct regular vulnerability assessments and penetration tests focusing on embedded devices to identify similar risks. Establish incident response plans specifically addressing exploitation scenarios for embedded device vulnerabilities. Finally, engage with vendors and industry groups to push for timely patches and coordinated vulnerability disclosures.