# Microsoft Defender vulnerabilities Source: https://junglewise.ai/threats/technologies/defender Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/defender.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 10 vulnerabilities in Microsoft Defender: 1 in the last 7 days and 2 in the last 90 days, 6 of them critical and 6 exploited in the wild. The most recent, CVE-2026-122194, was published on 10 November 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 1 - Last 30 days: 1 - Last 90 days: 2 - All time: 10 (6 critical, 6 exploited in the wild) ## About Microsoft Defender Microsoft Defender is an antimalware and endpoint protection security suite. ## Latest Microsoft Defender vulnerabilities - [CVE-2026-122194: Microsoft Defender null pointer dereference remote code execution](https://junglewise.ai/threats/cve-2026-122194-null-pointer-dereference-in-microsoft-defender-allows-an) (high, CVSS 8.8, published 10 Nov 2026) - [CVE-2026-105726: Microsoft Defender out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-105726-out-of-bounds-read-in-microsoft-defender-allows-an-authorized) (medium, CVSS 5.5, published 13 Oct 2026) - [CVE-2026-69414: Microsoft Defender Malware Protection Engine elevation of privilege](https://junglewise.ai/threats/cve-2026-69414-microsoft-defender-malware-protection-engine-elevation-of) (high, CVSS 7.8, published 14 Aug 2026) - [CVE-2026-45584: Microsoft Defender heap buffer overflow](https://junglewise.ai/threats/cve-2026-45584-microsoft-defender-heap-buffer-overflow) (high, CVSS 8.1, published 20 May 2026) - [CVE-2026-45498: Microsoft Defender denial of service](https://junglewise.ai/threats/cve-2026-45498-microsoft-defender-denial-of-service) (critical, exploited in the wild, CVSS 4, published 20 May 2026) - [CVE-2026-41091: Microsoft Defender privilege escalation via improper link resolution](https://junglewise.ai/threats/cve-2026-41091-microsoft-defender-privilege-escalation-via-improper-link) (critical, exploited in the wild, CVSS 7.8, published 20 May 2026) - [CVE-2008-4250: Microsoft Windows buffer overflow in Server service](https://junglewise.ai/threats/cve-2008-4250-microsoft-windows-buffer-overflow-in-server-service) (critical, exploited in the wild, CVSS 10, published 20 May 2026) - [CVE-2026-33825: Microsoft Defender privilege escalation in Antimalware Platform](https://junglewise.ai/threats/cve-2026-33825-microsoft-defender-privilege-escalation-in-antimalware-platform) (critical, exploited in the wild, CVSS 7.8, published 14 Apr 2026) - [CVE-2022-44698: Microsoft Defender SmartScreen Security Feature Bypass Vulnerability](https://junglewise.ai/threats/cve-2022-44698-microsoft-defender-smartscreen-security-feature-bypass) (critical, exploited in the wild, CVSS 5.4, published 13 Dec 2022) - [CVE-2021-1647: Microsoft Defender Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2021-1647-microsoft-defender-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 7.8, published 3 Nov 2021) ## Most severe Microsoft Defender vulnerabilities - [CVE-2008-4250: Microsoft Windows buffer overflow in Server service](https://junglewise.ai/threats/cve-2008-4250-microsoft-windows-buffer-overflow-in-server-service) (critical, exploited in the wild, CVSS 10, published 20 May 2026) - [CVE-2026-33825: Microsoft Defender privilege escalation in Antimalware Platform](https://junglewise.ai/threats/cve-2026-33825-microsoft-defender-privilege-escalation-in-antimalware-platform) (critical, exploited in the wild, CVSS 7.8, published 14 Apr 2026) - [CVE-2026-41091: Microsoft Defender privilege escalation via improper link resolution](https://junglewise.ai/threats/cve-2026-41091-microsoft-defender-privilege-escalation-via-improper-link) (critical, exploited in the wild, CVSS 7.8, published 20 May 2026) - [CVE-2021-1647: Microsoft Defender Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2021-1647-microsoft-defender-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 7.8, published 3 Nov 2021) - [CVE-2022-44698: Microsoft Defender SmartScreen Security Feature Bypass Vulnerability](https://junglewise.ai/threats/cve-2022-44698-microsoft-defender-smartscreen-security-feature-bypass) (critical, exploited in the wild, CVSS 5.4, published 13 Dec 2022) - [CVE-2026-45498: Microsoft Defender denial of service](https://junglewise.ai/threats/cve-2026-45498-microsoft-defender-denial-of-service) (critical, exploited in the wild, CVSS 4, published 20 May 2026) - [CVE-2026-122194: Microsoft Defender null pointer dereference remote code execution](https://junglewise.ai/threats/cve-2026-122194-null-pointer-dereference-in-microsoft-defender-allows-an) (high, CVSS 8.8, published 10 Nov 2026) - [CVE-2026-45584: Microsoft Defender heap buffer overflow](https://junglewise.ai/threats/cve-2026-45584-microsoft-defender-heap-buffer-overflow) (high, CVSS 8.1, published 20 May 2026) - [CVE-2026-69414: Microsoft Defender Malware Protection Engine elevation of privilege](https://junglewise.ai/threats/cve-2026-69414-microsoft-defender-malware-protection-engine-elevation-of) (high, CVSS 7.8, published 14 Aug 2026) - [CVE-2026-105726: Microsoft Defender out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-105726-out-of-bounds-read-in-microsoft-defender-allows-an-authorized) (medium, CVSS 5.5, published 13 Oct 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 1 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 1 | 0 | 0 | ## Other Microsoft technologies - [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities - [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities - [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities - [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities - [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities - [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities - [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities - [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities - [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities - [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities - [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities - [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft Defender vulnerabilities", https://junglewise.ai/threats/technologies/defender, 13 November 2026.