Junior 5G Security Researcher: Protocol & Firmware

CACI International Inc; Florham Park (NJ); On-site; USD 79,000 - 163,000; Full time

Job summary

CACI International Inc is seeking a Junior 5G Vulnerability Researcher to join our security team, focusing on protocol analysis and firmware reverse engineering within complex telecom stacks.

The role emphasizes independent research, tool development in Python, and wireless protocol understanding. Candidates should possess a systems background, experience with 3GPP protocols, and the ability to craft automated analysis tooling for national mobile infrastructure security.

Qualifications

• 3 years of professional experience in software exploitation, reverse engineering, or protocol development.
• Proficiency in software development (C/C++, Python).
• Working knowledge of networking protocols (TCP/IP, SCTP, HTTP/2).
• Experience with disassembly tools such as IDA Pro, Ghidra, or Binary Ninja.
• Foundational understanding of binary analysis and memory corruption primitives.
• Demonstrated ability to conduct independent technical research and analyze complex software systems.
• Must be a US Citizen and able to obtain/maintain a security clearance.

Responsibilities

• Execute research into 3GPP protocols (NGAP, GTP, etc.) to identify crashes and logic flaws using stateful fuzzing techniques.
• Perform static and dynamic analysis on compiled telecom binaries and firmware to understand undocumented protocol logic.
• Support the development of custom Python3 scripts for protocol decoding and automating analysis of closed-box systems.
• Assist in mapping state machines within 5G session management flows using symbolic or concolic execution tools.
• Analyze signaling and data plane components to identify potential attack surfaces in 5G Core and RAN environments.
• Use debugging tools and packet analysis software (e.g., Wireshark) to inspect protocol traffic and hardware state.
• Document research findings and contribute to the development of technical security reports.

Skills

C/C++

Python

Networking protocols

Tools

IDA Pro

Ghidra

Binary Ninja

Job description

CACI International Inc is seeking a Junior 5G Vulnerability Researcher to join our security team, focusing on protocol analysis and firmware reverse engineering within complex telecom stacks.

The role emphasizes independent research, tool development in Python, and wireless protocol understanding. Candidates should possess a systems background, experience with 3GPP protocols, and the ability to craft automated analysis tooling for national mobile infrastructure security.