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Junior Vulnerability Researcher (5G & Protocol Security)

Company

CACI International Inc

Location

Florham Park, New Jersey

Posted

June 19, 2026

Position Overview

Job Title: Junior Vulnerability Researcher (5G & Protocol Security)Job Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: Top SecretEmployee Type: RegularPercentage of Travel Required: NoneType of Travel: None* * *The Opportunity:


We are seeking a Vulnerability Researcher to join our 5G security team, focusing on protocol analysis and firmware reverse engineering. This role is for a practitioner with a strong systems background who is ready to take ownership of research tasks within complex telecommunications stacks. You will work as part of a high-performing group, identifying security flaws in 3GPP protocols and proprietary telecom binaries while developing the automated tooling necessary to secure national mobile infrastructure.

Responsibilities:

  • Execute research into 3GPP protocols (NGAP, GTP, etc.) to identify crashes and logic flaws using stateful fuzzing techniques.

  • ...

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