CVE-2017-3796 in WebEx Meetings Server
Summary
by MITRE
A vulnerability in Cisco WebEx Meetings Server could allow an authenticated, remote attacker to execute predetermined shell commands on other hosts. More Information: CSCuz03353. Known Affected Releases: 2.6.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2017-3796 represents a critical command injection flaw within Cisco WebEx Meetings Server version 2.6, which enables authenticated remote attackers to execute arbitrary shell commands on affected systems. This vulnerability resides in the server's handling of user input within specific administrative functions, creating a pathway for malicious actors to escalate their privileges and gain unauthorized control over the underlying host systems. The flaw specifically manifests when the server processes certain parameters without adequate sanitization, allowing attackers to inject malicious commands that are then executed with the privileges of the WebEx service account. The vulnerability's impact extends beyond simple command execution, as it can potentially allow attackers to establish persistent access, escalate privileges, or compromise the entire network infrastructure that relies on the affected WebEx server.
This vulnerability aligns with CWE-77 and CWE-94 categories within the Common Weakness Enumeration framework, specifically addressing improper neutralization of special elements used in commands and improper handling of potentially malicious input. The ATT&CK framework categorizes this issue under T1059.001 for command and scripting interpreter, where adversaries leverage command injection techniques to execute arbitrary code. The authentication requirement for exploitation means that attackers must first obtain valid credentials, typically through credential theft, brute force attacks, or social engineering tactics. The affected WebEx Meetings Server 2.6 release represents a particularly vulnerable configuration where the input validation mechanisms fail to properly sanitize user-supplied data before processing, creating an attack surface that can be exploited by threat actors with minimal additional privileges. The remote nature of the vulnerability means that attackers can exploit it from outside the network perimeter, making it especially dangerous for organizations that maintain remote access capabilities.
The operational impact of CVE-2017-3796 extends beyond immediate command execution, as successful exploitation can lead to complete system compromise and potential data exfiltration. Attackers can leverage this vulnerability to install backdoors, modify system configurations, or establish persistence mechanisms that allow continued access even after initial exploitation. The vulnerability's presence in the WebEx server creates a potential attack vector for broader network infiltration, as the compromised system could serve as a launching point for lateral movement within the organization's network infrastructure. Organizations relying on WebEx Meetings Server for business continuity face significant risk of service disruption, data breaches, and regulatory compliance violations. The vulnerability's remediation requires immediate patching of the affected software version, though organizations should also implement network segmentation and monitoring to detect potential exploitation attempts. Security teams must conduct thorough vulnerability assessments to identify all instances of the affected WebEx server versions and ensure proper access controls are implemented to limit the potential impact of credential compromise.
Cisco's official advisory CSCuz03353 provides specific guidance for addressing this vulnerability, emphasizing the importance of applying security patches promptly and implementing network access controls. Organizations should consider implementing additional security measures such as intrusion detection systems, network monitoring tools, and regular security assessments to detect and prevent exploitation attempts. The vulnerability's classification as a remote command execution flaw means that organizations must also review their authentication mechanisms and implement multi-factor authentication to reduce the risk of unauthorized access. Furthermore, security professionals should monitor for indicators of compromise related to this vulnerability and establish incident response procedures to address potential exploitation attempts. The remediation process should include comprehensive testing of patches in non-production environments before deployment to ensure operational stability and prevent service disruptions. Regular security updates and vulnerability management programs become essential for maintaining protection against similar vulnerabilities in the future.