The open-access website of the HKEX was hacked, the second such cyberattack since August 2011.
An unrelated software bug in the vendor-supplied trading platform forced the exchange to suspend derivatives trading.
But it was soon isolated and fixed.
Source: https://www.databreaches.net/hong-kong-stock-exchange-hkex-website-hacked/
"id": "HON2328291222",
"linkid": "hkex",
"type": "Cyber Attack",
"date": "09/2019",
"severity": "60",
"impact": "2",
"explanation": "Attack limited on finance or reputation"