CVE-2022-41082: in the CISA KEV catalogue
Microsoft Exchange Server Remote Code Execution Vulnerability. CISA added CVE-2022-41082 to the Known Exploited Vulnerabilities catalogue on 2022-09-30 with a default due date of 2022-10-21. Known ransomware campaign use: Known. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- Microsoft Exchange Server
- CWE
- CWE-502
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 100%, percentile 99 (scored 2026-11-04)
EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2022-41082 in the CISA KEV catalogue?
Yes. CISA added CVE-2022-41082 (Microsoft Exchange Server Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-09-30. CISA's default due date for it is 2022-10-21.
Is CVE-2022-41082 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2022-41082.
What should I do about CVE-2022-41082?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2022-41082