Senior Vulnerability Researcher (5G & Protocol Security) Florham Park, NJ, US

## Senior Vulnerability Researcher (5G & Protocol Security)
Florham Park, NJ, USApply Now Find out how well you match with this jobJob ID330409

Job Title:

Senior Vulnerability Researcher (5G & Protocol Security)
Job Category:
Engineering Time Type:
Full time Minimum Clearance Required to Start:
None Employee Type:
Regular Percentage of

Travel Required:

Up to 10%
Type of Travel:
Continental US     
*
* The Opportunity:

** We are seeking a Senior Vulnerability Researcher with deep expertise in telecommunications security, 3

GPP protocols, and advanced reverse engineering. This role is ideal for a specialist who thrives on technical ambiguity and enjoys probing the 5G stack for critical flaws. You’ll play a key role in evaluating the security and robustness of proprietary telecom systems—reverse-engineering "closed-box" binaries, developing stateful fuzzers, and uncovering vulnerabilities that contribute directly to national cybersecurity efforts.

** Responsibilities:
*** Investigate edge-case behaviors and low-level protocol signaling to reveal attack surfaces in proprietary telecom and embedded systems.
* Apply advanced binary analysis to reverse-engineer proprietary 5G baseband firmware and Network Function (NF) binaries where source code is unavailable.
* Develop custom tools and scripts in Python3 to automate protocol decoding, firmware unpacking, and analysis workflows.
* Develop and deploy custom stateful fuzzers for 3

GPP protocols (e.g., NGAP, HTTP/2, PFCP, GTP-U) to identify crashes and stability issues in the 5G Core.
* Utilize concolic and symbolic execution (e.g., Angr, Manticore) to map complex state machines and uncover logic flaws in 5G session management and authentication flows.
* Create reliable Proof-of-Concept (PoC) exploits for discovered vulnerabilities in critical components such as AMF, SMF, or UPF.
* Document findings clearly and translate technical protocol complexity into actionable reports for security and engineering teams.
*
* Qualifications:

*
*
* Required:

** 7+ years of professional experience in vulnerability research, protocol analysis, or reverse engineering.
* Deep understanding of 5G/4G architecture and 3

GPP security standards.
* Detailed understanding of networking and telecom protocol stacks, including signaling, management and data plane components.
* Experience with Linux kernel internals or RTOS environments used in telecom hardware.
* Hands-on experience with disassembly and decompilation tools (e.g., IDA Pro, Ghidra, Binary Ninja) and hardware-assisted debugging.
* Must be a US Citizen, and able to obtain/maintain a security clearance
* Desired:
** An active TS//SCI clearance is highly desired.
* Experience in exploit development and vulnerability discovery in embedded or telecom environments.
* Proven track record of reconstructing proprietary binary protocols and analyzing "closed-box" telecom equipment.
* Mastery of C/C++ and high proficiency in Python for automation and tool development.
* Familiarity with radio access network (RAN) components and baseband security.
* Ability to build scalable fuzzing infrastructure and analysis tools in a team setting.
* Background in hardware-level analysis, including firmware extraction and inspecting hardware state via JTAG or UART.

- ** What You Can Expect:
**** A culture of integrity.
** At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.
** An environment of trust.
** CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.
** A focus on continuous growth.
** Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.
** Pay Range**:

There are a host of factors that can influence final salary…