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{"timestamp": "2026-06-17T03:34:52.270Z", "date_only": false, "value": "2026-06-17T03:34:52.270", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2021-21123", "record": "FKIE_CVE-2021-21123", "field": "lastModified"}, {"timestamp": "2026-09-01T17:00:47.747Z", "date_only": false, "value": "2026-09-01T17:00:47.747399Z", "kind": "sighting", "label": "Seen", "source": "https://t.me/cissp/3473", "record": "CVE-2021-21123", "field": "creation_timestamp", "uuid": "885c23c2-e392-4617-b936-409c4b2b8d81", "content": "Whitepaper\n\"Spoofing Downloaded Filename's Extension\nin Chromium\", 2021.\n\n// This whitepaper illustrates exploitation of an insufficient data validation vulnerability in the Chromium framework (CVE-2021-21123)", "url": "https://t.me/cissp/3473"}, {"timestamp": "2026-09-01T17:00:57.190Z", "date_only": false, "value": "2026-09-01T17:00:57.190939Z", "kind": "sighting", "label": "Seen", "source": "https://t.me/cissp/2705", "record": "CVE-2021-21123", "field": "creation_timestamp", "uuid": "159c9a36-3390-488f-aa44-1a899442d07a", "content": "CVE-2021-21123, CVE-2021-21129, CVE-2021-21130, CVE-2021-21131, CVE-2021-21141:\nGoogle Chrome File System Access API vulnerabilities (PoC)\nhttps://github.com/Puliczek/CVE-2021-21123-PoC-Google-Chrome\n\nExploration of x86-64 ISA using speculative execution\nhttps://github.com/can1357/haruspex\n]-> Speculating The Entire X86-64 Instruction Set In Seconds:\nhttps://blog.can.ac/2021/03/22/speculating-x86-64-isa-with-one-weird-trick\n\nRed Team Tactics\nExploiting JSON Web Token\nhttps://medium.com/@sajan.dhakate/exploiting-json-web-token-jwt-73d172b5bc02\n\nFuzzing Windows\nhttps://github.com/intel/kernel-fuzzer-for-xen-project/wiki/Fuzzing-Windows\n\nThreat Research\nGoogle Chrome Renderer RCE (PoC for CVE-2020-15972)\nhttps://securitylab.github.com/research/one_day_short_of_a_fullchain_renderer\n]-> Full exploit:\nhttps://github.com/github/securitylab/tree/main/SecurityExploits/Chrome/blink/CVE-2020-15972", "url": "https://t.me/cissp/2705"}, {"timestamp": "2026-09-11T04:00:05.826Z", "date_only": false, "value": "2026-09-11T04:00:05.826480Z", "kind": "sighting", "label": "Published proof of concept", "source": "https://t.me/cissp/3473", "record": "CVE-2021-21123", "field": "creation_timestamp", "uuid": "ebe28e72-6a30-46e5-b824-6901eb3eb5fc", "content": "Whitepaper\n\"Spoofing Downloaded Filename's Extension\nin Chromium\", 2021.\n\n// This whitepaper illustrates exploitation of an insufficient data validation vulnerability in the Chromium framework (CVE-2021-21123)", "url": "https://t.me/cissp/3473"}, {"timestamp": "2026-09-11T14:00:05.785Z", "date_only": false, "value": "2026-09-11T14:00:05.785806Z", "kind": "sighting", "label": "Published proof of concept", "source": "https://t.me/cissp/2705", "record": "CVE-2021-21123", "field": "creation_timestamp", "uuid": "5078cdb8-932d-4c0e-aedd-d327f7153004", "content": "CVE-2021-21123, CVE-2021-21129, CVE-2021-21130, CVE-2021-21131, CVE-2021-21141:\nGoogle Chrome File System Access API vulnerabilities (PoC)\nhttps://github.com/Puliczek/CVE-2021-21123-PoC-Google-Chrome\n\nExploration of x86-64 ISA using speculative execution\nhttps://github.com/can1357/haruspex\n]-> Speculating The Entire X86-64 Instruction Set In Seconds:\nhttps://blog.can.ac/2021/03/22/speculating-x86-64-isa-with-one-weird-trick\n\nRed Team Tactics\nExploiting JSON Web Token\nhttps://medium.com/@sajan.dhakate/exploiting-json-web-token-jwt-73d172b5bc02\n\nFuzzing Windows\nhttps://github.com/intel/kernel-fuzzer-for-xen-project/wiki/Fuzzing-Windows\n\nThreat Research\nGoogle Chrome Renderer RCE (PoC for CVE-2020-15972)\nhttps://securitylab.github.com/research/one_day_short_of_a_fullchain_renderer\n]-> Full exploit:\nhttps://github.com/github/securitylab/tree/main/SecurityExploits/Chrome/blink/CVE-2020-15972", "url": 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