Telecommunications providers operate critical infrastructure that enables global communications, including mobile networks, fixed-line networks, internet service provision, and cloud communications platforms. Telecom operators are targeted by nation-state actors seeking intelligence collection, cybercriminals exploiting billing systems, and attackers targeting the infrastructure that other industries depend upon.
Penetration testing for telecom must cover a vast and diverse technology landscape including core network infrastructure, customer-facing portals and apps, billing and CRM systems, OSS/BSS platforms, 5G infrastructure, and interconnection points with other operators. Telecom-specific testing may include SIP/VoIP security testing, SS7 vulnerability assessment, and testing of mobile network components.
The deployment of 5G networks, network function virtualisation (NFV), and software-defined networking (SDN) has introduced new attack vectors that require testing by specialists who understand telecom architectures. Telecom operators in Europe must comply with NIS 2, the European Electronic Communications Code, and national telecom security regulations.
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Award-winning Cheltenham-based cybersecurity consultancy with NCSC CHECK Green Light status and CREST approval, specialising in defence, government, and critical national infrastructure security.
Cybersecurity division of the Thales Group, with ANSSI, CREST, FedRAMP 3PAO, and NATO-cleared personnel. Defence, government, and critical infrastructure penetration testing worldwide.
US penetration testing firm founded in 2011, running 600+ engagements a year with a fully remote, US-based team. Manual, expert-led testing across web, network, cloud, mobile, wireless, OT/ICS, and AI/LLM. Gartner Sample Vendor for PTaaS.
Ethical hacking team within Orange Cyberdefense with a 20+ year track record. Known for building industry-standard security tools and groundbreaking research.
Frankfurt-based European payment security specialist holding the full set of PCI credentials (QSA, PFI, ASV, P2PE). Manual-first penetration testing for fintechs, acquirers, and regulated enterprises.
Australia and New Zealand's largest pure-play cybersecurity firm with offices in every major ANZ capital. CREST ANZ accredited and IRAP-listed for Australian Government testing.
Sydney-headquartered Australian cybersecurity firm founded in 1997, now part of Infosys. CREST-approved with OSCP, OSCE, and OSEE-certified testers.
Vienna-headquartered Austrian cybersecurity consultancy with a prolific Vulnerability Lab research program and deep expertise in IoT and embedded systems security across the DACH region.
Swiss cybersecurity firm with major Singapore operation. CREST accredited, CSA-licensed in Singapore. Manual exploitation focus with the proprietary MAD reporting platform.
Specialised testing includes SS7 vulnerability assessment, SIP/VoIP security testing, 5G network testing, billing system testing, and interconnection security assessment.
5G introduces new architectures (network slicing, edge computing, virtualised network functions) that require testing of cloud-native infrastructure, API-driven service orchestration, and new trust boundaries.
Key risks include SS7 exploitation, SIM swapping, billing fraud, customer data breaches, infrastructure compromise enabling mass surveillance, and supply chain attacks on network equipment.