A revisit of remote Spectre attacks on Cloudflare Workers
In 2024 and 2025, we reassessed remote Spectre attacks on our Workers infrastructure. We share details about the new attack primitives like Spectre gadgets, remote timers, achieving co-location and how new defenses further harden Cloudflare Workers.
Summary
Research indicates that remote Spectre attacks can efficiently exploit microarchitectural vulnerabilities in Cloudflare Workers. The findings highlight significant security implications for cloud services, particularly regarding data leakage risks.
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