CVE-2018-7935 in E5573Cs-322
Summary
by MITRE • 02/10/2023
There is a vulnerability in 21.328.01.00.00 version of the E5573Cs-322. Remote attackers could exploit this vulnerability to make the network where the E5573Cs-322 is running temporarily unavailable.
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Analysis
by VulDB Data Team • 03/24/2025
The vulnerability identified as CVE-2018-7935 affects the E5573Cs-322 device running firmware version 21.328.01.00.00, representing a critical network availability issue that can be exploited by remote attackers to disrupt service operations. This device operates within telecommunications infrastructure and serves as a network access device that provides connectivity services to end users. The flaw manifests as a denial of service condition that can temporarily render the entire network segment where the device operates inaccessible to legitimate users.
The technical nature of this vulnerability stems from improper handling of network traffic or protocol processing within the device's firmware implementation. Attackers can craft specific network packets or requests that trigger a malfunction in the device's processing logic, causing it to crash or enter an unstable state. This behavior aligns with CWE-119, which addresses improper access to memory locations, and may also relate to CWE-400, concerning uncontrolled resource consumption that can lead to denial of service conditions. The vulnerability allows remote exploitation without requiring authentication, making it particularly dangerous as attackers can initiate the attack from external networks.
The operational impact of this vulnerability extends beyond simple network disruption, as it can affect service availability for multiple users simultaneously. When the device becomes unavailable, all network connections passing through it are severed, potentially impacting business operations, emergency services, or critical communication infrastructure. The temporary nature of the disruption means that while the device may recover automatically after a period, the service interruption can cause significant operational damage and require manual intervention to restore full functionality. This vulnerability directly impacts the availability component of the CIA triad and can be categorized under ATT&CK technique T1499, which covers network denial of service attacks.
Organizations should implement immediate mitigations including firmware updates from the vendor to address the specific vulnerability, network segmentation to limit the impact scope, and monitoring systems to detect anomalous traffic patterns that may indicate exploitation attempts. Network administrators should also consider implementing access controls and firewalls to restrict unnecessary network access to the device while maintaining essential operational capabilities. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other network infrastructure components, ensuring comprehensive protection against similar threats. The incident underscores the importance of maintaining current firmware versions and establishing robust network monitoring procedures to detect and respond to potential exploitation attempts effectively.