CVE-2025-12771 is a stack-based buffer overflow vulnerability identified in IBM Concert versions 1.0.0 through 2.1.0. The root cause is improper restriction of operations within the bounds of a memory buffer (CWE-119), specifically due to insufficient bounds checking on stack-allocated buffers. This flaw allows a local user with low privileges to overflow the buffer, potentially overwriting the stack and enabling arbitrary code execution. The vulnerability does not require user interaction but does require local access and privileges, which lowers the attack complexity but limits remote exploitation. Successful exploitation could lead to full compromise of the affected system under the context of the exploited user, impacting confidentiality, integrity, and availability. The CVSS v3.1 base score is 7.8, reflecting high severity with metrics AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability. No public exploits or patches are currently available, so organizations must rely on mitigation strategies until a fix is released. IBM Concert is an enterprise software product used in various business environments, making this vulnerability relevant to organizations relying on this software for critical operations.

For European organizations, this vulnerability poses a significant risk especially in environments where IBM Concert is deployed on workstations or servers accessible by multiple users. The ability for a local user to execute arbitrary code can lead to privilege escalation, data breaches, or disruption of business processes. Confidentiality is at risk as attackers could access sensitive data; integrity is compromised through unauthorized code execution; and availability could be affected if systems are destabilized or taken offline. In sectors such as finance, manufacturing, or government, where IBM Concert might be used for coordination or operational tasks, this could lead to operational disruptions or regulatory non-compliance. The local access requirement limits remote exploitation but insider threats or compromised accounts could leverage this vulnerability. The lack of patches increases the window of exposure, necessitating proactive defense measures.

1. Restrict local access to systems running IBM Concert to trusted personnel only, employing strict access controls and monitoring. 2. Implement the principle of least privilege to limit user permissions on affected systems, reducing the impact of potential exploitation. 3. Employ endpoint detection and response (EDR) tools to monitor for unusual process behavior or memory corruption indicators. 4. Use application whitelisting to prevent unauthorized code execution. 5. Regularly audit and review user accounts and permissions on systems running IBM Concert. 6. Prepare for rapid deployment of patches or updates once IBM releases a fix, including testing in controlled environments. 7. Consider isolating IBM Concert installations in segmented network zones to limit lateral movement if compromise occurs. 8. Educate users about the risks of local exploitation and enforce strong physical security controls to prevent unauthorized local access. 9. Maintain up-to-date backups to enable recovery in case of system compromise.