CVE-2026-83155 in Siebel CRM Deployment
Summary
by MITRE • 09/16/2026
Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.7. Easily exploitable vulnerability allows low privileged attacker with access to the physical communication segment attached to the hardware where the Siebel CRM Deployment executes to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 7.3 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Server Infrastructure component of Oracle Siebel CRM, specifically affecting deployment versions ranging from 17.0 through 26.7. This security flaw is classified as a critical infrastructure weakness that compromises the integrity and availability of the enterprise resource planning system. The nature of this vulnerability allows for exploitation by an attacker who possesses low-level privileges but maintains physical access to the communication segment attached to the hardware hosting the Siebel CRM Deployment service. Unlike many remote code execution vulnerabilities, this flaw does not require network-based interaction or user interface manipulation, relying instead on direct physical proximity to the target infrastructure. This characteristic significantly alters the threat landscape, as it shifts the attack vector from a broad internet-facing surface to a localized, physically constrained environment that typically requires insider threats or sophisticated physical intrusion capabilities.
From a technical perspective, the vulnerability enables an attacker with low privileges and local network access to compromise the Siebel CRM Deployment system. The exploitation mechanism likely involves manipulating data packets or control signals on the attached communication segment to trigger unintended behavior within the server infrastructure layer. Because the attack vector is adjacent rather than remote, it exploits trust relationships often inherent in internal network architectures where devices are assumed to be secure due to their physical location behind firewalls and access controls. The lack of required user interaction further simplifies the exploitation process for an attacker who has achieved this level of physical or logical proximity, allowing them to execute attacks without needing to trick a system administrator into clicking malicious links or opening compromised files.
The operational impact of successfully exploiting this vulnerability is severe, primarily affecting confidentiality and availability as indicated by the CVSS 3.1 base score of 7.3. An attacker can achieve unauthorized access to critical data stored within the Siebel CRM environment, potentially exposing sensitive customer information, financial records, or proprietary business strategies. Furthermore, the vulnerability grants the ability to cause a hang or frequently repeatable crash of the Siebel CRM Deployment service, resulting in a complete denial of service condition. This disruption halts business operations that rely on real-time access to customer relationship data, leading to significant downtime and potential revenue loss. The combination of high confidentiality impact and high availability impact underscores the critical nature of this flaw for organizations dependent on continuous uptime and strict data privacy compliance.
In terms of industry standard classifications, this vulnerability aligns with CWE-269 Improper Privilege Management if the low privilege requirement is insufficient to prevent access to sensitive infrastructure components, or potentially CWE-400 Uncontrolled Resource Consumption if the denial-of-service aspect stems from resource exhaustion attacks facilitated by malformed inputs on the communication segment. From an ATT&CK perspective, this falls under T1539 Stolen Web Session Credentials if physical access leads to credential theft, but more accurately maps to T1078 Valid Accounts when considering low-privileged accounts being leveraged for unauthorized access, and T1499 Endpoint Denial of Service regarding the crash capabilities. The adjacent attack vector (AV:A) highlights the importance of securing not just digital perimeters but also physical access points where critical infrastructure hardware is located.
Mitigation strategies must address both technical controls and physical security protocols. Organizations should immediately apply vendor-provided patches or updates that resolve this specific flaw in the Server Infrastructure component for all affected versions between 17.0 and 26.7. Since exploitation requires low-privileged access to the physical communication segment, it is imperative to enforce strict physical access controls around server rooms and network closets where Siebel CRM hardware resides. Implementing port security features on switches connected to these segments can prevent unauthorized devices from attaching to the network infrastructure. Additionally, deploying intrusion detection systems that monitor for anomalous traffic patterns indicative of local exploitation attempts can provide early warning signs. Regular audits of physical access logs and strict enforcement of least privilege principles for all accounts with any level of system interaction are essential steps in reducing the risk surface associated with this vulnerability.