{"vulnerability": "cve-2021-20990", "sightings": [{"uuid": "6745f5bc-10cf-497c-859a-e9797f504ee9", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20990", "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": "6e38cdb8-38a5-4138-90a5-66c25f4ff792", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20990", "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": "2026-09-01T17:00:52.998618Z"}, {"uuid": "701a2448-6eb3-4a21-8c85-e9f3ed318722", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20990", "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": "2026-09-02T01:04:43.102063Z"}, {"uuid": "c4ef11ec-4e0a-44f2-9fef-76972e2e03e4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20990", "type": "published-proof-of-concept", "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": "2026-09-11T09:00:05.518587Z"}, {"uuid": "22c5c306-bda1-4be7-b31d-648728de60b3", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-20990", "type": "published-proof-of-concept", "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": "2026-09-12T00:00:45.415187Z"}]}