Detections
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Microsoft Exchange Server RCE (ProxyShell)

critical Nessus Plugin ID 152458

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Synopsis

The remote mail server is affected by a remote code execution vulnerability.

Description

The Microsoft Exchange running on the remote host is affected by a remote code execution vulnerability. An unauthenticated remote attacker can exploit this to execute arbitrary code.

Solution

Microsoft has released the following security updates to address this issue:
 -KB5001779

See Also

http://www.nessus.org/u?561ed41c

http://www.nessus.org/u?870f8220

Plugin Details

Severity: Critical

ID: 152458

File Name: exchange_proxyshell.nbin

Version: 1.79

Type: remote

Agent: windows

Family: Windows

Published: 8/11/2021

Updated: 7/10/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-34473

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:exchange_server

Required KB Items: installed_sw/Outlook Web Access

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/13/2021

Vulnerability Publication Date: 7/13/2021

CISA Known Exploited Vulnerability Due Dates: 11/17/2021

Exploitable With

Metasploit (Microsoft Exchange ProxyShell RCE)

Reference Information

CVE: CVE-2021-34473

MSFT: MS21-5001779

MSKB: 5001779