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Advisories

Tornado before 6.5.9 Denial of Service via Query String

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severity
medium
date
Affecting

  • tornado >= 0, < 6.5.9

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
iaohkut-from-NightWolf-Team, manus-pi
Description
Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests with thousands of query parameters. Attackers can send unauthenticated GET requests with unbounded query-string field counts to degrade response times for all clients sharing the same IOLoop.

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