Overview
Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311; https://nvd.nist.gov/vuln/detail/CVE-2023-35311
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2023-35311 |
| Vendor / Product | Microsoft — Outlook |
| NVD Published | 2023-07-11 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 8.8 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Severity | HIGH |
| CWE | CWE-367 |
| CISA KEV Added | 2023-07-11 |
| CISA KEV Deadline | 2023-08-01 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2023-08-01.
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Timeline
| Date | Event |
|---|---|
| 2023-07-11 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2023-08-01 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2023-35311 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |