ProxyNotShell (CVE-2022-41082)
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA 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
Also Known as ProxyNotShell
Part of the ProxyNotShell pair; this CVE is the Exchange Server remote code execution half, used together with CVE-2022-41040. CrowdStrike later found a different route (OWASSRF) to reach it that bypassed the ProxyNotShell mitigations.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Severity
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:CExploitation Context
as of October 12, 2026- CISA added CVE-2022-41082 to the KEV catalog 3 days before its CVE record was published.
- It is one of 390 Microsoft entries in the CISA KEV catalog, and one of 166 added in 2022.
- Its current EPSS score (100.0%) is higher than that of 95% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 to <15.00.1497.044 |
| Microsoft | Microsoft Microsoft Exchange Server 2016 Cumulative Update 22 | 15.0.0 to <15.01.2375.037 |
| Microsoft | Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 | 15.02.0 to <15.02.0986.036 |
| Microsoft | Microsoft Microsoft Exchange Server 2019 Cumulative Update 12 | 15.02.0 to <15.02.1118.020 |
| Microsoft | Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0 to <15.01.2507.016 |
References
7 Links- https://www.vicarius.io/vsociety/posts/cve-2022-41082-microsoft-exchange-server-remote-code-execution-vulnerability-detection-script
- https://www.vicarius.io/vsociety/posts/cve-2022-41082-microsoft-exchange-server-remote-code-execution-vulnerability-mitigation-script
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-41082
- http://packetstormsecurity.com/files/170066/Microsoft-Exchange-ProxyNotShell-Remote-Code-Execution.html
- https://www.secpod.com/blog/microsoft-november-2022-patch-tuesday-patches-65-vulnerabilities-including-6-zero-days/
Record Details
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