CVE-2021-26857 KEV
7.8
HIGH · CVSS 3.1 · EPSS 95.8% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2022-05-03.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Scoring
| CVSS | 7.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 95.76% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | yes — remediate by 2022-05-03 |
| Public exploit | none known |
| Published | 2021-03-03 |
| Last modified | 2026-08-19 |
CISA KEV
| Name | Microsoft Exchange Server Remote Code Execution Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2022-05-03 |
| Vendor / product | Microsoft / Exchange Server |
| Ransomware use | known |
Affected (1)
| Vendor | Product |
|---|---|
| microsoft | exchange server |
References
→ the Explorer · watch your stack · NVD