| ID | 49954 |
| Created | Mar 04, 2021 |
| Updated | Sep 20, 2021 |
| Outbreak Alert | Microsoft Exchange CISAtop20_PRC2022 |
| Severity |
|
| Default Action | drop |
| Affected OS | Windows |
| Affected App | MS_Exchange |
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Threat Encyclopedia
MS.Exchange.Server.CVE-2021-26858.Remote.Code.Execution
Description
This indicates an attack attempt to exploit a Remote Code Execution in Microsoft Exchange Server.
The vulnerability is due to insufficient sanitization when handling a malicious request. A remote attacker may be able to exploit this to disclose data or execute arbitrary code within the context of the application, via a crafted HTTP request.
Affected Products
Microsoft Exchange Server 2016 Cumulative Update 19
Microsoft Exchange Server 2019 Cumulative Update 8
Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 7
Microsoft Exchange Server 2016 Cumulative Update 18
Impact
System Compromise: Remote attackers can gain control of vulnerable systems.
Recommended Actions
Apply the most recent upgrade or patch from the vendor.
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26858
