What is the CVSS score of CVE-2022-41040?

CVE-2022-41040 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 94.1%.

Is there a public PoC exploit available for CVE-2022-41040?

Yes, a public proof-of-concept exploit is available for CVE-2022-41040. Prioritise patching immediately. EPSS: 94.1%.

How to fix or mitigate CVE-2022-41040?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Implement egress filtering and URL validation for server-side requests.

CVE-2022-41040

HIGH

Server-Side Request Forgery (SSRF) (CWE-918)

2022-10-03 secure@microsoft.com

8.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-918 OWASP Top 10:2025 A10:2021 - Server-Side Request Forgery ASVS 5.0 V12 - Files and Resources SSRF prevention, URL validation MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	High risk (CVSS 8.8, EPSS 94.1%). While requiring authentication (unlike ProxyLogon/ProxyShell), stolen or phished credentials are commonly available to attackers. Exploitation was detected in the wild from September 2022.
Exploit ScenarioDerived	An attacker with stolen Exchange credentials exploits the SSRF to access the PowerShell remoting backend, then chains CVE-2022-41082 (deserialization) to execute commands on the Exchange server as SYSTEM.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 94.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 26, 2026

Microsoft Exchange Server contains an SSRF vulnerability known as 'ProxyNotShell' that allows authenticated attackers to access backend Exchange services, chained with CVE-2022-41082 for remote code execution.

Earlier versions of this analysis (1)

v1 Mar 26, 2026 - 11:19 CVSS 8.8

A server-side request forgery in Exchange Server allows authenticated users to access internal backend services. Known as the first component of 'ProxyNotShell,' this was the third major Exchange SSRF (after ProxyLogon and ProxyShell).

RemediationAI

Apply Microsoft security updates. Implement URL rewrite rules as a temporary mitigation. Restrict Exchange PowerShell access. Enable MFA for all Exchange accounts.

Affected ProductsAI

Microsoft Exchange Server 2013/2016/2019

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The CWE-918 SSRF exploits Exchange's Client Access proxy to access the PowerShell backend, similar to ProxyShell but requiring valid credentials. The vulnerability allows an authenticated mailbox user to forge requests to internal Exchange services.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Oct 30, 2025 - 19:36 cisa

CISA KEV

PoC Detected

Oct 30, 2025 - 19:36 vuln.today

Public exploit code

Patch released

Oct 30, 2025 - 19:36 nvd

Patch available

CVE Published

Oct 03, 2022 - 01:15 nvd

HIGH 8.8

DescriptionCVE.org

Microsoft Exchange Server Elevation of Privilege Vulnerability

Executive ViewAI

Why It Matters

CVE-2022-41040 presents significant security risk, a server-side request forgery vulnerability rated CVSS 8.8. Attackers could trick authenticated users into performing unintended actions, potentially modifying critical settings or data. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. A patch is available and should be applied as part of regular vulnerability management.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement strict egress filtering; (2) Use allowlists for outbound connections; (3) Block access to cloud metadata endpoints.

Threat Intelligence Overview

Threat Score

9.6/10

Composite threat intelligence

EPSS Score

94.1%

Top 0% exploitable

Threat Intel

1 sources

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

NVD

CVE.org

CISA KEV

EPSS POC (1) THREAT

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC Yes

EPSS 94.1%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.