High 8.8Known exploited (CISA KEV)Published Oct 2, 2022

CVE-2022-41040Microsoft Exchange Server Elevation of Privilege Vulnerability

Updated under an hour ago (Oct 27, 2026, 7:20 PM ET)

Does this affect you?

It affects Microsoft Exchange Server 2013 Cumulative Update 23 and 5 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Sep 30, 2022; federal agencies had to remediate by Oct 21, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for Microsoft Exchange Server 2013 Cumulative Update 23

Exploited in the last 30 days

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Weakness (CWE): CWE-918
Known exploited: Added to CISA KEV Sep 30, 2022; federal remediation due Oct 21, 2022; known ransomware useApply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 99.96% (percentile 100)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 microsoft:exchange_server_2013_cumulative_update_23 (from the name)	from 15.00.0 before 15.00.1497.044	CNA record
Microsoft Microsoft Exchange Server 2016 Cumulative Update 22 microsoft:exchange_server_2016_cumulative_update_22 (from the name)	from 15.0.0 before 15.01.2375.037	CNA record
Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 microsoft:exchange_server_2019_cumulative_update_11 (from the name)	from 15.02.0 before 15.02.0986.036	CNA record
Microsoft Microsoft Exchange Server 2019 Cumulative Update 12 microsoft:exchange_server_2019_cumulative_update_12 (from the name)	from 15.02.0 before 15.02.1118.020	CNA record
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 microsoft:exchange_server_2016_cumulative_update_23 (from the name)	from 15.01.0 before 15.01.2507.016	CNA record
microsoft exchange_server microsoft:exchange_server	2013; 2016; 2016; 2019; 2019	NVD

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-41040	vendor-advisory, patch
http://packetstormsecurity.com/files/170066/Microsoft-Exchange-ProxyNotShell-Remote-Code-Execution.html	exploit, third-party-advisory, vdb-entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-41040	mitigation, patch, vendor-advisory
https://www.kb.cert.org/vuls/id/915563	third-party-advisory, us-government-resource
https://www.secpod.com/blog/microsoft-november-2022-patch-tuesday-patches-65-vulnerabilities-including-6-zero-days/	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-41040	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.