{"vulnerability": "CVE-2021-20991", "sightings": [{"uuid": "2039524c-c5d7-437a-abf2-32042bcfb11c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20991", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/3192", "content": "#exploit\n#IoT_Security\nCVE-2021-20989, CVE-2021-20990,\nCVE-2021-20991, CVE-2021-20992:\nMultiple vulnerabilities in Fibaro Home Center (PoC)\nhttps://seclists.org/fulldisclosure/2021/Apr/27", "creation_timestamp": "2021-04-23T11:02:04.000000Z"}, {"uuid": "df898ed3-bf64-41e4-9de6-e816551238a6", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20991", "type": "seen", "source": "https://t.me/cissp/3009", "content": "A Reference-Counting Bug in the Linux Kernel io_uring Subsystem (PoC for CVE-2021-20226)\nhttps://www.zerodayinitiative.com/blog/2021/4/22/cve-2021-20226-a-reference-counting-bug-in-the-linux-kernel-iouring-subsystem\n\nOffensive security:\nOffensive Security Guide to SSH Tunnels and Proxies\nhttps://posts.specterops.io/offensive-security-guide-to-ssh-tunnels-and-proxies-b525cbd4d4c6\n\nexploit\nIoT_Security\nCVE-2021-20989, CVE-2021-20990,\nCVE-2021-20991, CVE-2021-20992:\nMultiple vulnerabilities in Fibaro Home Center (PoC)\nhttps://seclists.org/fulldisclosure/2021/Apr/27\n\nRed Team Tactics:\n1. As-Exploits 404Team\nhttps://github.com/yzddmr6/As-Exploits\n2. MS External Email Warning Bypass\nhttps://whynotsecurity.com/blog/external-email-warning-bypass", "creation_timestamp": "2026-09-01T17:00:53.125915Z"}]}