Sinkhole

In telecom networks, a Sinkhole is a controlled destination (typically at the DNS or BGP layer) used to absorb traffic that would otherwise reach malicious infrastructure, allowing operators to neutralize botnet C2 and protect subscribers. Sinkholing is commonly coordinated with CSIRTs and law enforcement.

Categories: Identity and SubscriberThreats and AttacksInternet and Routing

Sinkhole in context

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) are the anchor for authentication, charging, lawful interception and fraud analytics. Any protocol or interface that leaks a permanent identifier is treated as a serious privacy defect, which is why 5G introduced SUCI concealment on the air interface.

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking and lawful-interception abuse. The common thread is that most attacks exploit the inherited trust model of legacy signaling. SS7 and Diameter were designed for a closed operator community that no longer exists.

To place Sinkhole in the wider telecom-security picture, review SIM Box, CGNAT, SIMBox Fraud, CSIRT, Cybersecurity and Insider Threat.

Related terms

Related topic hubs

  • Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.

More from the TelcoSec Glossary

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