CISA Known Exploited Vulnerabilities - https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Google Project Zero (GP0) "0day In the Wild" spreadsheet - https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/view
Full Disclosure - https://seclists.org/fulldisclosure/
National Vulnerability Database - https://nvd.nist.gov/
Vulmon Trends - https://vulmon.com/trends
CIRCL CVE feed - https://cvepremium.circl.lu/
Mitre CVE feed - https://twitter.com/CVEnew
Receive Vulnerability Alerts - https://alerts.vulmon.com/
CVE Details - https://www.cvedetails.com/index.php
AusCERT Security Bulletins - https://www.auscert.org.au/resources/security-bulletins/
Tencent Threat Notices - https://s.tencent.com/research/bsafe/
CXSECURITY - Exploits & Bug tracking - https://cxsecurity.com/
Exploit Database - https://www.exploit-db.com/
Patrowl CVE feeds - https://www.patrowl.io/
OpenCVE feeds - https://www.opencve.io/cve
BugBountyHunting - https://www.bugbountyhunting.com/
ZDI - https://www.zerodayinitiative.com/advisories/upcoming/
Security Wizardry - https://www.securitywizardry.com/the-radar-page/alert-details
Cisco Talos - https://blog.talosintelligence.com/search/label/CVE
Zero Science Lab 0days - https://www.zeroscience.mk/en/vulnerabilities/
Wiz's Open Cloud Vulnerability & Security Issue Database - https://www.cloudvulndb.org/
https://twitter.com/gentilkiwi
https://twitter.com/bad_packets
https://twitter.com/orange_8361
https://twitter.com/chompie1337
Pwn2Own - https://twitter.com/search?q=%23pwn2own&src=typed_query&f=live
Tianfu Cup - https://twitter.com/search?q=Tianfu%20Cup&src=typed_query&f=live