Product / Microsoft
Microsoft Exchange Server in CISA KEV
Answer CISA's KEV catalog lists 17 vulnerabilities in Microsoft Exchange Server as of catalog 2026.09.23, 4.4% of Microsoft's 388 entries. First added 2021-11-03, latest 2026-04-13; 13 ransomware-linked.
- KEV entries
- 17
- Ransomware: known
- 1376.5%
- First added
- 2021-11-03
- Latest added
- 2026-04-13
- Median days to due
- 21
- Open deadlines
- 0federal
TAdditions by year
| Year | Added |
|---|---|
| 2021 | 9 |
| 2022 | 4 |
| 2023 | 1 |
| 2024 | 2 |
| 2025 | 0 |
| 2026 | 1 |
WWeaknesses
| CWE | Entries | Share |
|---|---|---|
| CWE-502 Unsafe deserialization | 4 | 23.5% |
| CWE-287 Improper authentication | 4 | 23.5% |
| CWE-918 Server-side request forgery | 3 | 17.6% |
| CWE-20 Improper input validation | 1 | 5.9% |
| CWE-434 Unrestricted file upload | 1 | 5.9% |
| CWE-39 | 1 | 5.9% |
EAll entries
| CVE | Vulnerability | Added | Due | Ransomware | CWE |
|---|---|---|---|---|---|
| CVE-2023-21529 | Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability | Known | CWE-502 | ||
| CVE-2021-31196 | Microsoft Exchange Server Information Disclosure Vulnerability | Unknown | none listed | ||
| CVE-2024-21410 | Microsoft Exchange Server Privilege Escalation Vulnerability | Unknown | CWE-287 | ||
| CVE-2022-41080 | Microsoft Exchange Server Privilege Escalation Vulnerability | Known | none listed | ||
| CVE-2022-41082 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | CWE-502 | ||
| CVE-2022-41040 | Microsoft Exchange Server Server-Side Request Forgery Vulnerability | Known | CWE-918 | ||
| CVE-2018-8581 | Microsoft Exchange Server Privilege Escalation Vulnerability | Known | none listed | ||
| CVE-2021-33766 | Microsoft Exchange Server Information Disclosure | Unknown | CWE-287 | ||
| CVE-2021-34523 | Microsoft Exchange Server Privilege Escalation Vulnerability | Known | CWE-287 | ||
| CVE-2021-34473 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | CWE-918 | ||
| CVE-2021-31207 | Microsoft Exchange Server Security Feature Bypass Vulnerability | Known | CWE-20, CWE-434 | ||
| CVE-2021-27065 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | CWE-39 | ||
| CVE-2021-26858 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | none listed | ||
| CVE-2021-26857 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | CWE-502 | ||
| CVE-2021-26855 | Microsoft Exchange Server Remote Code Execution Vulnerability | Known | CWE-918 | ||
| CVE-2020-17144 | Microsoft Exchange Server Remote Code Execution Vulnerability | Unknown | CWE-502 | ||
| CVE-2020-0688 | Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability | Known | CWE-287 |
Cite this
CISA's KEV catalog lists 17 vulnerabilities in Microsoft Exchange Server. 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-exchange-server/
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.