ProxyNotShell is the name for two Microsoft Exchange Server vulnerabilities, CVE-2022-41040 and CVE-2022-41082, that attackers can use together for remote code execution. CVE-2022-41040 is a server-side request forgery flaw. CVE-2022-41082 allows remote code execution when the attacker can reach Exchange PowerShell. Unit 42 reports that GTSC discovered them as a zero-day very similar to ProxyShell.
Updated
| CVE | Title | Vendor | CVSS | EPSS | KEV | Published |
|---|---|---|---|---|---|---|
| CVE-2022-41082KEV Microsoft Exchange Server Remote Code Execution Vulnerability | Microsoft Exchange Server Remote Code Execution Vulnerability | Microsoft | 8.0 | 100.0% | KEV | 2022-10-03 |
| CVE-2022-41040KEV Microsoft Exchange Server Elevation of Privilege Vulnerability | Microsoft Exchange Server Elevation of Privilege Vulnerability | Microsoft | 8.8 | 100.0% | KEV | 2022-10-03 |
Microsoft Exchange Server Server-Side Request Forgery Vulnerability
Part of the ProxyNotShell pair of Microsoft Exchange Server zero-days found by GTSC in August 2022; this CVE is the elevation of privilege (server-side request forgery) half. Unit 42 describes the pair as very similar to the 2021 ProxyShell chain.
Microsoft Exchange Server Remote Code Execution Vulnerability
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.
| CVE | Added | Due | Ransomware |
|---|---|---|---|
| CVE-2022-41040 | 2022-09-30 | 2022-10-21 | Known use |
| CVE-2022-41082 | 2022-09-30 | 2022-10-21 | Known use |
| CVE | Vendor | Product | Versions |
|---|---|---|---|
| CVE-2022-41040 | Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 to <15.00.1497.044 |
| CVE-2022-41040 | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 22 | 15.0.0 to <15.01.2375.037 |
| CVE-2022-41040 | Microsoft | Microsoft Exchange Server 2019 Cumulative Update 11 | 15.02.0 to <15.02.0986.036 |
| CVE-2022-41040 | Microsoft | Microsoft Exchange Server 2019 Cumulative Update 12 | 15.02.0 to <15.02.1118.020 |
| CVE-2022-41040 | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0 to <15.01.2507.016 |
| CVE-2022-41082 | Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 to <15.00.1497.044 |
| CVE-2022-41082 | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 22 | 15.0.0 to <15.01.2375.037 |
| CVE-2022-41082 | Microsoft | Microsoft Exchange Server 2019 Cumulative Update 11 | 15.02.0 to <15.02.0986.036 |
| CVE-2022-41082 | Microsoft | Microsoft Exchange Server 2019 Cumulative Update 12 | 15.02.0 to <15.02.1118.020 |
| CVE-2022-41082 | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0 to <15.01.2507.016 |
ProxyNotShell is the name for two Microsoft Exchange Server vulnerabilities, CVE-2022-41040 and CVE-2022-41082, that attackers can use together for remote code execution. CVE-2022-41040 is a server-side request forgery flaw. CVE-2022-41082 allows remote code execution when the attacker can reach Exchange PowerShell. Unit 42 reports that GTSC discovered them as a zero-day very similar to ProxyShell.
ProxyNotShell covers two CVEs: CVE-2022-41040 and CVE-2022-41082.
2 of the 2 ProxyNotShell CVEs are in the CISA Known Exploited Vulnerabilities catalog as of 2026-11-03: CVE-2022-41040 (added 2022-09-30) and CVE-2022-41082 (added 2022-09-30).
The highest CVSS base score among the ProxyNotShell CVEs is 8.8 (HIGH), for CVE-2022-41040.
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). Alert titles and links from CISA cybersecurity alerts. This site is not affiliated with or endorsed by MITRE, NVD, CISA, or FIRST.