Vodafone Idea (AS55410) BGP Hijack Briefly Diverts 30,000+ Global Prefixes into India
On 16–17 April 2021, Vodafone Idea Ltd's AS55410 suddenly originated more than 30,000 prefixes it did not own — against roughly 824 normally — including address space of Google, Microsoft, Akamai, Cloudflare and Fastly, producing a 13x surge of inbound traffic into its Indian network.
02Deep-Dive Technical Analysis
Starting at about 13:48 UTC on 16 April, AS55410 began originating 31,000+ routes, all AS-path prepended. Although Vodafone Idea has several upstreams, the announcements propagated via AS9498 (Bharti Airtel), which did not filter them, and were accepted by networks not performing Route Origin Validation. Kentik netflow data showed a 13x spike in inbound traffic to AS55410, where traffic attracted by the bogus routes was dropped. The origination was corrected within minutes, but some announcements kept circulating globally for an hour or more.
03Vulnerability & Exploit Flow
Accidental origination of foreign prefixes, propagated by upstreams lacking customer prefix and AS-path filtering.
04Recommended Defense & Mitigation Protocol
Enforce RPKI Route Origin Validation (ROV), deploy RFC 8212 default-reject BGP policies, filter customer announcements against IRR/RPKI data, and configure strict maximum-prefix limits.
05Security Impact & Geopolitical Consequence
Vodafone Idea attributed the incident to a wrong routing advertisement by one of its enterprise customers and said it was rectified immediately; MANRS and other analysts pointed to missing customer route filtering at Vodafone Idea and its upstream as the deeper failure, strengthening the case for MANRS filtering and RPKI Route Origin Validation.
06Authoritative Standards & External References
07Related Topic Cluster Records
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