{"vulnerability": "CVE-2021-39863", "sightings": [{"uuid": "2a685d5c-6ff4-4d68-bf69-622d19464aa4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "seen", "source": "https://t.me/cibsecurity/29662", "content": "\u203c CVE-2021-39863 \u203c\n\nAcrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Buffer Overflow vulnerability when parsing a specially crafted PDF file. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2021-09-29T20:37:16.000000Z"}, {"uuid": "414830be-6cc4-46b6-abf7-4201a8f53b25", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/4451", "content": "#exploit\n#Analytics\n#Threat_Research\nAnalysis of a Heap Buffer-Overflow Vulnerability in Adobe Acrobat Reader DC (CVE-2021-39863)\nhttps://blog.exodusintel.com/2021/10/04/analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2", "creation_timestamp": "2022-05-28T05:21:52.000000Z"}, {"uuid": "8187d5c7-961f-4db0-a9a4-0db569ed5934", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "seen", "source": "https://t.me/cissp/4527", "content": "exploit\nAnalytics\nThreat Research\nAnalysis of a Heap Buffer-Overflow Vulnerability in Adobe Acrobat Reader DC (CVE-2021-39863)\nhttps://blog.exodusintel.com/2021/10/04/analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2/?utm_source=feedly&utm_medium=rss&utm_campaign=analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2\n\nCloud Security\nBlue Team Techniques\nSecurity Monitoring across \"Azure AD\"\nand \"Active Directory\"\nhttps://github.com/Cloud-Architekt/AzureAD-Attack-Defense/blob/main/IdentitySecurityMonitoring.md\n\nOffensive security\n1. Automated All-in-One OS Command Injection\nExploitation Tool\nhttps://github.com/commixproject/commix\n2. Tool for hacking/security testing to (JSON Web Token)\nhttps://github.com/hahwul/jwt-hack\n\nSCADA Security\nA curated list of tools related to Industrial Control System Security and Penetration Testing\nhttps://github.com/kh4sh3i/ICS-Pentesting-Tools\n\n\n\u200e", "creation_timestamp": "2026-09-01T17:00:39.020638Z"}, {"uuid": "85463c41-a9fd-435f-8d8f-52f78f243bfa", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "seen", "source": "https://t.me/cissp/4527", "content": "exploit\nAnalytics\nThreat Research\nAnalysis of a Heap Buffer-Overflow Vulnerability in Adobe Acrobat Reader DC (CVE-2021-39863)\nhttps://blog.exodusintel.com/2021/10/04/analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2/?utm_source=feedly&utm_medium=rss&utm_campaign=analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2\n\nCloud Security\nBlue Team Techniques\nSecurity Monitoring across \"Azure AD\"\nand \"Active Directory\"\nhttps://github.com/Cloud-Architekt/AzureAD-Attack-Defense/blob/main/IdentitySecurityMonitoring.md\n\nOffensive security\n1. Automated All-in-One OS Command Injection\nExploitation Tool\nhttps://github.com/commixproject/commix\n2. Tool for hacking/security testing to (JSON Web Token)\nhttps://github.com/hahwul/jwt-hack\n\nSCADA Security\nA curated list of tools related to Industrial Control System Security and Penetration Testing\nhttps://github.com/kh4sh3i/ICS-Pentesting-Tools\n\n\n\u200e", "creation_timestamp": "2026-09-02T01:04:24.156239Z"}, {"uuid": "1fefeac4-65a9-46e1-8877-14112e151191", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "published-proof-of-concept", "source": "https://t.me/cissp/4527", "content": "exploit\nAnalytics\nThreat Research\nAnalysis of a Heap Buffer-Overflow Vulnerability in Adobe Acrobat Reader DC (CVE-2021-39863)\nhttps://blog.exodusintel.com/2021/10/04/analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2/?utm_source=feedly&utm_medium=rss&utm_campaign=analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2\n\nCloud Security\nBlue Team Techniques\nSecurity Monitoring across \"Azure AD\"\nand \"Active Directory\"\nhttps://github.com/Cloud-Architekt/AzureAD-Attack-Defense/blob/main/IdentitySecurityMonitoring.md\n\nOffensive security\n1. Automated All-in-One OS Command Injection\nExploitation Tool\nhttps://github.com/commixproject/commix\n2. Tool for hacking/security testing to (JSON Web Token)\nhttps://github.com/hahwul/jwt-hack\n\nSCADA Security\nA curated list of tools related to Industrial Control System Security and Penetration Testing\nhttps://github.com/kh4sh3i/ICS-Pentesting-Tools\n\n\n\u200e", "creation_timestamp": "2026-09-10T18:00:05.269863Z"}, {"uuid": "d9e8de2d-8ca8-4e08-baa2-4ab636af89ff", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-39863", "type": "published-proof-of-concept", "source": "https://t.me/cissp/4527", "content": "exploit\nAnalytics\nThreat Research\nAnalysis of a Heap Buffer-Overflow Vulnerability in Adobe Acrobat Reader DC (CVE-2021-39863)\nhttps://blog.exodusintel.com/2021/10/04/analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2/?utm_source=feedly&utm_medium=rss&utm_campaign=analysis-of-a-heap-buffer-overflow-vulnerability-in-adobe-acrobat-reader-dc-2\n\nCloud Security\nBlue Team Techniques\nSecurity Monitoring across \"Azure AD\"\nand \"Active Directory\"\nhttps://github.com/Cloud-Architekt/AzureAD-Attack-Defense/blob/main/IdentitySecurityMonitoring.md\n\nOffensive security\n1. Automated All-in-One OS Command Injection\nExploitation Tool\nhttps://github.com/commixproject/commix\n2. Tool for hacking/security testing to (JSON Web Token)\nhttps://github.com/hahwul/jwt-hack\n\nSCADA Security\nA curated list of tools related to Industrial Control System Security and Penetration Testing\nhttps://github.com/kh4sh3i/ICS-Pentesting-Tools\n\n\n\u200e", "creation_timestamp": "2026-09-11T00:00:31.222128Z"}]}