Fast Facts
- Researchers uncovered dozens of vulnerabilities in open-source LTE/5G core networks rooted in implicit trust between components, enabling potential DoS and session hijacking attacks over the internet.
- Attackers can exploit protocol misconfigurations by injecting crafted PFCP or GTP-C messages, leading to core network crashes or redirecting user traffic to malicious actors.
- The study demonstrated real-world risks where attackers manipulate session management to hijack user data streams, with some vulnerabilities already addressed by vendors and others pending remediation.
Threat, Attack Techniques, and Targets
The recent study reports 84 vulnerabilities in 4G and 5G core networks. These flaws are mainly due to implicit trust errors in signaling interfaces. Attackers can exploit these weaknesses to cause denial-of-service (DoS) attacks or hijack user sessions. The attack techniques involve sending crafted messages, such as Packet Forwarding Control Protocol (PFCP) and GPRS Tunnelling Protocol (GTP-C), to core network components. Attackers can obtain network interface details through public sources or scanning. They can then inject malicious messages, especially when boundary enforcement is weak. Victims include users connected via mobile networks, and attackers can operate remotely or as malicious user devices. These attacks focus on exploiting the trust between network functions to seize control or disrupt services.
Impact, Security Implications, and Remediation Guidance
The vulnerabilities can lead to a complete loss of network control through DoS or session hijacking. Successful exploitation can make an attacker take over user sessions or crash core network functions. This poses serious security risks, especially in cloud-native deployments, where trust models are more fragile. Some flaws have been addressed, such as CVE-2026-8233 for a vendor named Dotouch. However, other core network vendors are still working on fixes. The security implications highlight the need for strict validation of messages and better boundary enforcement. Since no specific remediation guidance is provided, it is recommended that vendors and network operators consult their product providers or official security advisories for updates and fixes.
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