CVE-2025-13707 is a vulnerability identified in Tencent's HunyuanDiT product, specifically within the model_resume function, where deserialization of untrusted data occurs without proper validation. Deserialization vulnerabilities arise when software deserializes data from untrusted sources, potentially allowing attackers to craft malicious input that, when deserialized, executes arbitrary code. In this case, the flaw allows remote attackers to execute code with root privileges, significantly elevating the threat level. Exploitation requires user interaction, such as visiting a malicious webpage or opening a malicious file, which triggers the vulnerable deserialization process. The vulnerability is classified under CWE-502 (Deserialization of Untrusted Data) and was assigned CVE-2025-13707 with a CVSS v3.0 score of 7.8, indicating high severity. The attack vector is local (AV:L), meaning the attacker must have some form of local access or user interaction, but no privileges are required (PR:N). The vulnerability impacts confidentiality, integrity, and availability (all rated high). No patches are currently linked, and no known exploits are reported in the wild, but the potential for severe damage exists due to root-level code execution. The vulnerability was publicly disclosed on December 23, 2025, by ZDI (Zero Day Initiative) under the identifier ZDI-CAN-27183.

For European organizations, the impact of CVE-2025-13707 can be severe. Successful exploitation allows attackers to execute arbitrary code with root privileges, potentially leading to full system compromise. This can result in data breaches, unauthorized access to sensitive information, disruption of services, and lateral movement within networks. Organizations relying on Tencent HunyuanDiT for critical operations, especially in sectors like finance, telecommunications, and government, face heightened risks. The requirement for user interaction reduces the likelihood of automated widespread exploitation but does not eliminate targeted attacks, especially spear-phishing or malicious document campaigns. The high confidentiality, integrity, and availability impact means that compromised systems could lead to significant operational and reputational damage. Additionally, the lack of available patches increases exposure time, necessitating immediate mitigation efforts.

1. Immediate mitigation should focus on restricting user interaction vectors: educate users to avoid opening untrusted files or visiting suspicious websites related to Tencent HunyuanDiT usage. 2. Implement network-level protections such as web filtering and email scanning to block malicious payloads that could trigger the vulnerability. 3. Employ application whitelisting and sandboxing to limit the execution context of the HunyuanDiT application and reduce the impact of potential code execution. 4. Monitor logs and system behavior for unusual activities indicative of exploitation attempts, such as unexpected process spawning or privilege escalations. 5. Since no official patches are currently available, consider isolating or limiting access to systems running vulnerable versions of HunyuanDiT, especially those with root-level privileges. 6. Engage with Tencent for updates and apply patches as soon as they are released. 7. Review and harden deserialization processes in custom integrations or configurations related to HunyuanDiT to ensure input validation and integrity checks are in place.