{
  "is": "issue",
  "title": "Network DDoS",
  "body": "\u003cp\u003eWe are experiencing a network-wide DDoS attempt impacting the\nperformance of the Tor network, which includes both onion services and\nnon-onion services traffic. We are currently investigating potential\nmitigations.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eUpdate, 2023-04-05\u003c/strong\u003e: The DDoS has significantly reduced in volume over the last month, although there are intermittent spikes that can still affect the performance of relays that get hit by them. Overall performance has improved, but can occasionally be slower when using affected relays. We are making significant progress on implementing our \u003ca href=\"https://gitlab.torproject.org/tpo/core/tor/-/issues/40634\"\u003eProof of Work defense\u003c/a\u003e, which should eliminate the incentive for much of these attacks. Other, more general DDoS defense work will happen after that.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eUpdate, 2022-10-25 12:00UTC\u003c/strong\u003e: There are several different kinds of overload going on that we are working on addressing. We are seeing performance degredation from an overload of exit connections and onion service circuit handshakes, causing our relays to deny circuit creations and degrade performance. Until we are able to determine mechanisms for rate limiting this activity, through development, experimentation, and testing, this DoS activity will continue to cause performance and reliability problems on the network. For details, see a \u003ca href=\"https://lists.torproject.org/pipermail/tor-relays/2022-October/020858.html\"\u003erecent thread\u003c/a\u003e on our tor-relays mailing list.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eUpdate, 2022-07-07 13:00UTC\u003c/strong\u003e: the overload we saw in the past few weeks seems\nto be gone now and performance improved over the last couple of days. However,\nthe DDoS is not over yet, but changed its nature. We are currently investigating\nhow we can mitigate the new overload, which is affecting, e.g., our directory\nauthorities. For details, see a\n\u003ca href=\"https://lists.torproject.org/pipermail/tor-relays/2022-July/020686.html\"\u003erecent thread\u003c/a\u003e\non our tor-relays mailing list.\u003c/p\u003e\n",
  "createdAt": "2022-06-09 14:00:00 +0000 UTC",
  "lastMod": "2026-06-02 16:38:52 -0400 -0400",
  "permalink": "https://torprojectstatus.org/issues/2022-06-09-network-ddos/",
  "severity": "disrupted",
  "resolved": true,
  "informational": false,
  "resolvedAt": "2023-05-09 09:00:00",
  "affected": ["v3 Onion Services"],
  "filename": "2022-06-09-network-ddos.md"
}