CVE-2021-26858
Summary
| CVE | CVE-2021-26858 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-03-03 00:15:00 UTC |
| Updated | 2023-12-29 17:16:00 UTC |
| Description | Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26857, CVE-2021-27065, CVE-2021-27078. |
Risk And Classification
EPSS: 0.895090000 probability, percentile 0.997720000 (date 2026-07-22)
CISA KEV: Listed on 2021-11-03; due 2022-05-03; ransomware use Known
Problem Types: NVD-CWE-noinfo
CISA Known Exploited Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Exchange Server |
| Name | Microsoft Exchange Server Remote Code Execution Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26858 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Microsoft | Exchange Server | 2013 | cumulative_update_23 | All | All |
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_18 | All | All |
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_19 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_7 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_8 | All | All |
| Application | Microsoft | Exchange Server | 2013 | cumulative_update_23 | All | All |
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_18 | All | All |
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_19 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_7 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_8 | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Security Update Guide - Microsoft Security Response Center | MISC | portal.msrc.microsoft.com | Patch, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.