Product / Microsoft
Microsoft Defender in CISA KEV
Answer CISA's KEV catalog lists 5 vulnerabilities in Microsoft Defender as of catalog 2026.09.23, 1.3% of Microsoft's 388 entries. First added 2021-11-03, latest 2026-05-20; 2 ransomware-linked.
- KEV entries
- 5
- Ransomware: known
- 240%
- First added
- 2021-11-03
- Latest added
- 2026-05-20
- Median days to due
- 14
- Open deadlines
- 0federal
TAdditions by year
| Year | Added |
|---|---|
| 2021 | 1 |
| 2022 | 1 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 0 |
| 2026 | 3 |
WWeaknesses
| CWE | Entries | Share |
|---|---|---|
| CWE-59 Link following | 1 | 20% |
| CWE-1220 | 1 | 20% |
| CWE-755 | 1 | 20% |
| CWE-122 Heap-based buffer overflow | 1 | 20% |
| CWE-1285 | 1 | 20% |
EAll entries
| CVE | Vulnerability | Added | Due | Ransomware | CWE |
|---|---|---|---|---|---|
| CVE-2026-45498 | Microsoft Defender Denial of Service Vulnerability | Unknown | none listed | ||
| CVE-2026-41091 | Microsoft Defender Link Following Vulnerability | Unknown | CWE-59 | ||
| CVE-2026-33825 | Microsoft Defender Insufficient Granularity of Access Control Vulnerability | Known | CWE-1220 | ||
| CVE-2022-44698 | Microsoft Defender SmartScreen Security Feature Bypass Vulnerability | Known | CWE-755 | ||
| CVE-2021-1647 | Microsoft Defender Remote Code Execution Vulnerability | Unknown | CWE-122, CWE-1285 |
Cite this
CISA's KEV catalog lists 5 vulnerabilities in Microsoft Defender. Source: Telemetry analysis of the CISA Known Exploited Vulnerabilities catalog, version 2026.09.23 (released 2026-09-23). https://glide-telemetry.pages.dev/products/microsoft-defender/
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.