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devmor01/21/20251 replyview on HN

There is another method to query the caches. This is mentioned in the article.


Replies

kevindamm01/21/2025

Ah, the VPN deployment which probes from various geographies? It has limited coverage (according to author, about 54% of all Cloudflare datacenters) but still a sometimes-working attack, granted.

However, Cloudflare are known for being harsh on VPN exit points and the behavior of requesting the same (unique each pass) image from every geography and then never again, would probably look significantly suspicious, but yeah it seems not to be a priority for cloudflare at the moment.