On July 2, 2019, at 13:42 UTC, one new firewall rule went live on every Cloudflare server at once. It contained a regular expression that backtracked so hard it pushed every CPU core serving HTTP to 100 %, and for 27 minutes the sites behind Cloudflare returned 502 errors. The Cloudflare outage was not an attack; it was a regex, a missing CPU... Weiterlesen
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Cloudflare outage 2019: how one regex caused 27 minutes of 502s
On July 2, 2019, at 13:42 UTC, one new firewall rule went live on every Cloudflare server at once. It contained a regular expression that backtracked so hard it pushed every CPU core serving HTTP to 100 %, and for 27 minutes the sites…
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