CVE-2022-41040VulnerabilityPublished 09/30/2022Updated 10/24/2026

CVE-2022-41040: Microsoft Exchange Server Server-Side Request Forgery Vulnerability

Affects Microsoft Exchange ServerSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 09/30/2022
KEV deadline: 10/21/2022
Ransomware: Used in ransomware campaigns
EPSS: 100.0% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

msrc-blog.microsoft.com/2022/09/29/customer-guidance-for-reported-zero-day-vulnerabilities-in-microsoft-exchange-server/ (opens in a new tab)
nvd.nist.gov/vuln/detail/CVE-2022-41040 (opens in a new tab)

Description

Microsoft Exchange Server allows for server-side request forgery. Dubbed "ProxyNotShell," this vulnerability is chainable with CVE-2022-41082 which allows for remote code execution.

Weaknesses

CWE-918Server-Side Request Forgery (SSRF) (opens in a new tab)

References

msrc-blog.microsoft.com/2022/09/29/customer-guidance-for-reported-zero-day-vulnerabilities-in-microsoft-exchange-server/ (opens in a new tab)
nvd.nist.gov/vuln/detail/CVE-2022-41040 (opens in a new tab)
cisa.gov/known-exploited-vulnerabilities-catalog?search=CVE-2022-41040 (opens in a new tab)

What to do

Description

Weaknesses

References

Related threats