CVE-2026-121510 in UD3TN
Summary
by MITRE • 11/03/2026
Remote Unauthenticated Heap Out-of-Bounds Write in µD3TN BPv6 Administrative Record Parser allows Unauthenticated Remote Attacker to Reliably Cause DoS
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as a remote unauthenticated heap out-of-bounds write within the µD3TN BPv6 administrative record parser represents a critical security flaw that compromises the integrity and availability of network infrastructure. This specific defect resides in the parsing logic responsible for handling Border Gateway Protocol version 6 (BPv6) administrative records, which are essential components in certain specialized networking protocols often used in tactical or dynamic environments. The core technical issue stems from insufficient validation of input data lengths relative to allocated memory buffers during the processing of these administrative records. When an unauthenticated remote attacker sends a specially crafted BPv6 packet containing malformed administrative record fields, the parser fails to correctly verify that the declared length of the record does not exceed the bounds of the pre-allocated heap buffer. This lack of rigorous boundary checking allows data from the malicious payload to be written beyond the intended memory allocation, corrupting adjacent heap metadata or other critical structures in memory.
The operational impact of this vulnerability is severe, primarily manifesting as a reliable denial-of-service condition against the affected system. Because the out-of-bounds write targets heap management structures, it frequently leads to immediate application crashes or kernel panics depending on the implementation context. The reliability of the exploit means that an attacker does not need complex conditions or specific timing windows; simply transmitting the malformed packet is sufficient to trigger the memory corruption and subsequent service disruption. This makes the vulnerability particularly dangerous in production environments where continuous availability is paramount, as it allows for persistent and easily executable attacks without requiring any form of authentication or prior access to the system. The ability to cause a crash reliably undermines the trustworthiness of the network node, potentially leading to cascading failures if this device plays a critical routing or forwarding role within the broader network topology.
From a classification perspective, this vulnerability aligns with CWE-787: Out-of-bounds Write, which describes writing data outside the bounds of allocated memory. This type of flaw is often categorized under CWE-120: Buffer Overflow in C/C++ if implemented using traditional buffer handling mechanisms without proper size checks. Furthermore, from an offensive security standpoint, this vulnerability maps to MITRE ATT&CK technique T1498.003: Network Denial of Service via Resource Exhaustion by Memory Corruption. The attacker leverages the memory corruption not for code execution in this specific scenario but specifically to destabilize the system state, forcing a crash that denies service to legitimate users and processes. Understanding these mappings is crucial for defenders who need to prioritize remediation efforts based on standardized risk frameworks and known attack patterns recognized across the industry.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary defense is the deployment of vendor-provided patches that address the specific parsing logic flaw in the BPv6 administrative record handler. These updates typically involve adding strict length validation checks before any memory copy operations occur, ensuring that the size specified in the packet header never exceeds the allocated buffer capacity. In addition to patching, network-level defenses such as ingress filtering and deep packet inspection can be employed to detect and block malformed packets containing suspicious BPv6 administrative records before they reach the vulnerable parser. Implementing rate limiting on incoming traffic from untrusted sources may also help mitigate the impact by reducing the frequency of potential attack attempts. Long-term remediation should include adopting memory-safe programming languages or libraries for future development cycles, which inherently prevent out-of-bounds writes through stricter type checking and automatic bounds verification, thereby eliminating entire classes of such vulnerabilities at their source.