Is It On KEV?

Microsoft Exchange Server

YES - ON THE CISA KEV LIST
CVE-2022-41082

Microsoft Exchange Server Remote Code Execution Vulnerability

CISA catalog due date2022-10-21
overdue since 2022-10-21
EPSS exploit probability (next 30 days)100.0% · 100percentile
From CVE publication to KEV listing-3 days (2022-10-03 → 2022-09-30)
Remediation window (KEV listing to due date)21 days
Days on the KEV list1503 days
Date added to KEV2022-09-30
Known ransomware campaign useKnown
VendorMicrosoft
ProductExchange Server
Weaknesses (CWE)CWE-502

Microsoft: 391 entries (22.0% of all KEV entries are from this vendor); 41 added in 2026.

BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.

Your BOD 26-04 window (SSVC tier helper)

Your remediation window ends:

Description

Microsoft Exchange Server contains an unspecified vulnerability that allows for authenticated remote code execution. Dubbed "ProxyNotShell," this vulnerability is chainable with CVE-2022-41040 which allows for the remote code execution.

Required action (CISA)

Apply updates per vendor instructions.

Notes

https://msrc-blog.microsoft.com/2022/09/29/customer-guidance-for-reported-zero-day-vulnerabilities-in-microsoft-exchange-server/; https://nvd.nist.gov/vuln/detail/CVE-2022-41082

References

Other KEV entries for this vendor: Microsoft

Microsoft - Vendors with KEV entries

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