CVE-2014-2121 in Hosted Collaboration Solution
Summary
by MITRE
The Java-based software in Cisco Hosted Collaboration Solution (HCS) allows remote attackers to cause a denial of service (closing of TCP ports) via unspecified vectors, aka Bug IDs CSCug77633, CSCug77667, CSCug78266, CSCug82795, and CSCuh58643.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 05/08/2026
The vulnerability identified as CVE-2014-2121 affects Cisco Hosted Collaboration Solution (HCS) software implementations that utilize Java-based components. This issue represents a significant security concern within Cisco's collaboration infrastructure, specifically targeting the network services that facilitate hosted collaboration solutions. The vulnerability manifests as a remote denial of service condition that can result in the closure of TCP ports, effectively disrupting communication services for legitimate users. The affected Cisco HCS software operates within enterprise environments where reliable network connectivity is essential for business operations, making this vulnerability particularly dangerous as it can compromise critical collaboration services.
The technical flaw resides within the Java-based processing mechanisms of the Cisco HCS platform, where unspecified attack vectors can trigger unexpected behavior in the network service handling. This vulnerability falls under the category of denial of service attacks, which are classified as CWE-400 in the Common Weakness Enumeration framework, specifically addressing unspecified vulnerabilities that can lead to system resource exhaustion or service disruption. The attack vectors remain unspecified in the initial CVE description, indicating that the exact mechanisms by which the TCP port closure occurs are not fully detailed in the public vulnerability report. This lack of specificity suggests that the vulnerability may involve multiple attack pathways or could be related to improper input validation, resource management issues, or protocol handling anomalies within the Java runtime environment.
The operational impact of this vulnerability extends beyond simple service interruption, as it can severely compromise the reliability and availability of hosted collaboration services. When TCP ports are closed as a result of this vulnerability, users experience complete loss of connectivity to the collaboration platform, potentially affecting thousands of users within an organization. The disruption can occur without any visible signs of malicious activity, making it particularly challenging to detect and respond to. From an attacker perspective, this vulnerability enables a low-effort, high-impact attack that can be executed remotely, requiring no authentication or specialized tools beyond basic network connectivity. The vulnerability's presence in hosted solutions means that organizations relying on Cisco HCS for their collaboration needs face potential business disruption, with impacts ranging from temporary service degradation to complete service outages that can last until the vulnerability is patched or mitigated.
Organizations affected by this vulnerability should immediately implement network segmentation and monitoring to detect anomalous port closure patterns that may indicate exploitation attempts. The mitigation strategy should include applying the relevant Cisco security patches and updates as released through their official security advisory channels. Network administrators should also consider implementing intrusion detection systems that can monitor for unusual TCP port behavior and establish network access controls that limit exposure to potentially vulnerable components. The vulnerability aligns with ATT&CK technique T1499 which covers network denial of service attacks, and organizations should treat this as a critical security issue requiring immediate attention. Additionally, implementing proper network monitoring and logging configurations will help detect exploitation attempts and provide forensic evidence for incident response activities. The vulnerability demonstrates the importance of maintaining up-to-date security patches for all software components, particularly those running in Java environments where memory management and resource handling can create potential attack surfaces.