CVE-2022-41082Known exploitationPublic exploitNetwork attack vector

Authenticated code execution via PowerShell deserialization

Published Oct 3, 2022 · Updated Oct 21, 2025

Deserialization in Exchange PowerShell in Microsoft Exchange Server allows remote authenticated users to execute arbitrary code. The Exchange PowerShell backend deserializes attacker-controlled data without safely restricting the resulting object behavior. Exploitation requires valid Exchange credentials and access to Exchange PowerShell; successful code runs in the server's Exchange context.

CVSS severity8.8
High
EPSS probability99.97%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Exchange PowerShell in Microsoft Exchange Server allows remote authenticated users to execute arbitrary code. The Exchange PowerShell backend deserializes attacker-controlled data without safely restricting the resulting object behavior. Exploitation requires valid Exchange credentials and access to Exchange PowerShell; successful code runs in the server's Exchange context.

The record

CVE
CVE-2022-41082
Published
Oct 3, 2022
Updated
Oct 21, 2025
Vendor
Microsoft
Product
Microsoft Exchange Server 2019 Cumulative Update 12
Classifications
CWE-502, T1059.001, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 1, 2022Exploitation reportedLimited targeted ProxyNotShell attacks
  2. Oct 3, 2022CVE publishedPublication date reported by the CVE source.
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.02.0 <15.02.1118.020

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Exchange Server 2019 Cumulative Update 12version=15.02.0 <15.02.1118.020
Microsoft · Microsoft Exchange Server 2013 Cumulative Update 23version=15.00.0 <15.00.1497.044
Microsoft · Microsoft Exchange Server 2019 Cumulative Update 11version=15.02.0 <15.02.0986.036
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23version=15.01.0 <15.01.2507.016
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 22version=15.0.0 <15.01.2375.037

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 2026522
Sep 11, 2026Unavailable
Sep 12, 2026509
Sep 13, 2026Unavailable
Sep 14, 2026500
Sep 15, 2026Unavailable
Sep 16, 2026559
Latest reporting daySep 16, 2026
Latest daily unique IPs559
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1059.001PowerShell
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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