Comparison Overview
T-Mobile

T-Mobile
12920 SE 38th St, Bellevue, WA, US, 98006
Last Update: 03/07/2026
As the supercharged Un-carrier, T-Mobile US, Inc. (NASDAQ: TMUS) is powered by an award-winning 5G network that connects more people, in more places, than ever before. With T-Mobile’s unique value proposition of best network, best value, and best experiences, the Un-car...

Telefónica
Spain, Madrid, 28050, ES
Last Update: 12/05/2026
Telefónica is today one of the largest telecommunications companies in the world in terms of market capitalisation and number of customers. We have the best infrastructure, as well as an innovative range of digital and data services; therefore, we are favorably position...
Compliance Ranges Comparison

T-Mobile







Telefónica






Benchmark & Cyber Underwriting Signals
Incidents vs Telecommunications Industry Avg (This Year)
T-Mobile has 61.29% more incidents than the average of same-industry companies with at least one recorded incident.
Incidents vs Telecommunications Industry Avg (This Year)
No incidents recorded for Telefónica in 2026.
Incident History - T-Mobile (X = Date, Y = Severity)
T-Mobile cyber incidents detection timeline including parent company and subsidiaries.
Incident History - Telefónica (X = Date, Y = Severity)
Telefónica cyber incidents detection timeline including parent company and subsidiaries.
Notable Incidents

T-Mobile

Telefónica
FAQ
Latest Global CVEs
An authentication bypass vulnerability exists in certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products. The issue is caused by improper handling of HTTP request paths and headers, which allows an unauthenticated attacker to manipulate requests in a manner that bypasses authentication and associated audit logging controls.
In Ciena's Navigator Network Control Suite (NCS) and Manage Control Plan (MCP), there are hidden system accounts used for internal software operations. Some of these accounts have default passwords that may be predictable. While these accounts have very limited permissions on their own, an attacker could combine an attack using one of these accounts with other potential weaknesses to launch a more significant attack, possibly leading to escalation of privilege on the system.
Buffer Overflow vulnerability in OpenHTJ2K v.0.18.4 and before allows an attacker to execute arbitrary code via the openhtj2k_decoder_impl::invoke, invoke_line_based, invoke_line_based_stream, and invoke_line_based_predecoded function in source/core/interface/decoder.cpp
Buffer Overflow vulnerability in OpenHTJ2K v.0.18.4 and before allows an attacker to execute arbitrary code via the j2k_precinct_subband::parse_packet_header() in source/core/coding/coding_units.cpp
Incorrect access control in the /api/License/deactivateOffline endpoint of CAXPerts UniversalPlantViewer WebServices Server v2.7.6 allows authenticated attackers with low-level privileges to cause a Denial of Service (DoS) via removing the license from the webserver.