{"vulnerability": "cve-2021-21871", "sightings": [{"uuid": "06ee6a58-9596-4b72-8256-3a282d4365e2", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21871", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/3719", "content": "#Threat_Research\n1. Google Compute Engine (GCE) VM takeover via DHCP flood\nhttps://github.com/irsl/gcp-dhcp-takeover-code-exec\n2. PowerISO DMG File Format Handler memory corruption vulnerability (CVE-2021-21871)\nhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1308\n3. Analysis of a UaF Vulnerability in Adobe Acrobat Reader DC\nhttps://blog.exodusintel.com/2021/04/20/analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc", "creation_timestamp": "2024-05-07T14:19:15.000000Z"}, {"uuid": "4b28dd84-6edf-4c28-8e48-3f5d576a68a2", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21871", "type": "seen", "source": "https://t.me/cissp/3597", "content": "Threat Research\n1. Google Compute Engine (GCE) VM takeover via DHCP flood\nhttps://github.com/irsl/gcp-dhcp-takeover-code-exec\n2. PowerISO DMG File Format Handler memory corruption vulnerability (CVE-2021-21871)\nhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1308\n3. Analysis of a use-after-free Vulnerability in Adobe Acrobat Reader DC\ud83d\ude19\nhttps://blog.exodusintel.com/2021/04/20/analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc/?utm_source=rss&utm_medium=rss&utm_campaign=analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc\n\nexploit\nCVE-2021-23383:\nThe package handlebars <4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source (PoC)\nhttps://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029\n+ Check the conditions for exploiting CVE-2021-23383 through the handlebars library version assessment:\nhttps://github.com/dn9uy3n/Check-CVE-2021-23383", "creation_timestamp": "2026-09-01T17:00:46.854834Z"}, {"uuid": "d88131dc-6adf-4f5f-aae4-b7876ab71d90", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21871", "type": "seen", "source": "https://t.me/cissp/3597", "content": "Threat Research\n1. Google Compute Engine (GCE) VM takeover via DHCP flood\nhttps://github.com/irsl/gcp-dhcp-takeover-code-exec\n2. PowerISO DMG File Format Handler memory corruption vulnerability (CVE-2021-21871)\nhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1308\n3. Analysis of a use-after-free Vulnerability in Adobe Acrobat Reader DC\ud83d\ude19\nhttps://blog.exodusintel.com/2021/04/20/analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc/?utm_source=rss&utm_medium=rss&utm_campaign=analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc\n\nexploit\nCVE-2021-23383:\nThe package handlebars <4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source (PoC)\nhttps://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029\n+ Check the conditions for exploiting CVE-2021-23383 through the handlebars library version assessment:\nhttps://github.com/dn9uy3n/Check-CVE-2021-23383", "creation_timestamp": "2026-09-02T01:04:34.409109Z"}, {"uuid": "9556ed5d-5809-4c10-8454-e1c99c7719de", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21871", "type": "published-proof-of-concept", "source": "https://t.me/cissp/3597", "content": "Threat Research\n1. Google Compute Engine (GCE) VM takeover via DHCP flood\nhttps://github.com/irsl/gcp-dhcp-takeover-code-exec\n2. PowerISO DMG File Format Handler memory corruption vulnerability (CVE-2021-21871)\nhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1308\n3. Analysis of a use-after-free Vulnerability in Adobe Acrobat Reader DC\ud83d\ude19\nhttps://blog.exodusintel.com/2021/04/20/analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc/?utm_source=rss&utm_medium=rss&utm_campaign=analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc\n\nexploit\nCVE-2021-23383:\nThe package handlebars <4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source (PoC)\nhttps://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029\n+ Check the conditions for exploiting CVE-2021-23383 through the handlebars library version assessment:\nhttps://github.com/dn9uy3n/Check-CVE-2021-23383", "creation_timestamp": "2026-09-11T03:00:05.487613Z"}, {"uuid": "a9d2a57c-70c7-466d-81a1-5b55e971aec0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21871", "type": "published-proof-of-concept", "source": "https://t.me/cissp/3597", "content": "Threat Research\n1. Google Compute Engine (GCE) VM takeover via DHCP flood\nhttps://github.com/irsl/gcp-dhcp-takeover-code-exec\n2. PowerISO DMG File Format Handler memory corruption vulnerability (CVE-2021-21871)\nhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1308\n3. Analysis of a use-after-free Vulnerability in Adobe Acrobat Reader DC\ud83d\ude19\nhttps://blog.exodusintel.com/2021/04/20/analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc/?utm_source=rss&utm_medium=rss&utm_campaign=analysis-of-a-use-after-free-vulnerability-in-adobe-acrobat-reader-dc\n\nexploit\nCVE-2021-23383:\nThe package handlebars <4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source (PoC)\nhttps://snyk.io/vuln/SNYK-JS-HANDLEBARS-1279029\n+ Check the conditions for exploiting CVE-2021-23383 through the handlebars library version assessment:\nhttps://github.com/dn9uy3n/Check-CVE-2021-23383", "creation_timestamp": "2026-09-12T00:00:55.308527Z"}]}