CVE-2021-42321
Summary
| CVE | CVE-2021-42321 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-11-10 01:19:00 UTC |
| Updated | 2023-12-28 16:16:00 UTC |
| Description | Microsoft Exchange Server Remote Code Execution Vulnerability |
Risk And Classification
EPSS: 0.903880000 probability, percentile 0.997900000 (date 2026-07-22)
CISA KEV: Listed on 2021-11-17; due 2021-12-01; ransomware use Known
Problem Types: NVD-CWE-Other
CISA Known Exploited Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Exchange |
| Name | Microsoft Exchange Server Remote Code Execution Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2021-42321 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_21 | All | All |
| Application | Microsoft | Exchange Server | 2016 | cumulative_update_22 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_10 | All | All |
| Application | Microsoft | Exchange Server | 2019 | cumulative_update_11 | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Microsoft Exchange Server ChainedSerializationBinder Remote Code Execution ≈ Packet Storm | MISC | packetstormsecurity.com | |
| Security Update Guide - Microsoft Security Response Center | MISC | portal.msrc.microsoft.com | |
| Microsoft Exchange Server Remote Code Execution ≈ Packet Storm | MISC | packetstormsecurity.com | |
| 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.
Legacy QID Mappings
- 50116 Microsoft Exchange Server Remote Code Execution (RCE) Vulnerability - November 2021