Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.
- Vendor
- Microsoft
- Product
- Exchange Server
- CVSS
- 8.4
- EPSS (exploit probability)
- 36.5%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-17144 being exploited?
Yes. CISA added CVE-2020-17144 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 36.5% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2020-17144 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (181 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Microsoft Exchange Server CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-96940 Microsoft Exchange Server privilege escalation via weak authorizationwrite-up | [ HIGH ] | 8.8 | 2.7% | — |
| CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data Vulnerabilityransomware use | [ HIGH ] | 8.8 | 59.3% | |
| CVE-2021-31196 Microsoft Exchange Server Information Disclosure Vulnerability | [ HIGH ] | 7.2 | 54.1% | |
| CVE-2024-21410 Microsoft Exchange Server Privilege Escalation Vulnerability | [ CRITICAL ] | 9.8 | 12.7% | |
| CVE-2022-41080 Microsoft Exchange Server Privilege Escalation Vulnerabilityransomware use | [ HIGH ] | 8.8 | 77.3% | |
| CVE-2022-41082 Microsoft Exchange Server Remote Code Execution Vulnerabilityransomware use | [ HIGH ] | 8.0 | 100.0% | |
| CVE-2022-41040 Microsoft Exchange Server Server-Side Request Forgery Vulnerabilityransomware use | [ HIGH ] | 8.8 | 100.0% | |
| CVE-2018-8581 Microsoft Exchange Server Privilege Escalation Vulnerabilityransomware use | [ HIGH ] | 7.4 | 27.6% |