CVE-2023-35311

Microsoft Outlook Security Feature Bypass Vulnerability

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311	Patch Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311	US Government Resource

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:microsoft:365_apps:-::::enterprise:::
	cpe:2.3:a:microsoft:office_2019:-::::::x64:
	cpe:2.3:a:microsoft:office_2019:-::::::x86:
	cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x64:
	cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x86:
	cpe:2.3:a:microsoft:outlook:2013:-:-::-:-::*
	cpe:2.3:a:microsoft:outlook:2013:sp1:::rt:::*
	cpe:2.3:a:microsoft:outlook:2016:::::::*

History

08 Oct 2026, 10:35

Type	Values Removed	Values Added
First Time		Microsoft office 2019 Microsoft office 2021
CPE	cpe:2.3:a:microsoft:office:2019:::::::* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::::*	cpe:2.3:a:microsoft:office_2019:-::::::x86: cpe:2.3:a:microsoft:office_2019:-::::::x64: cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x64: cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x86:

Information

Published : 2023-07-11 18:15

Updated : 2026-10-08 10:35

NVD link : CVE-2023-35311

Mitre link : CVE-2023-35311

CVE.ORG link : CVE-2023-35311

JSON object : View

Products Affected

microsoft

outlook
office_2021
office_2019
365_apps

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

{"id": "CVE-2023-35311", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-35311", "role": "CISA Coordinator", "options": [{"exploitation": "active"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2025-02-04T17:53:50.345525Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.6}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft 365 Apps for Enterprise", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC 2021", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Office 2019", "versions": [{"status": "affected", "version": "19.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Outlook 2016", "versions": [{"status": "affected", "version": "16.0.0.0", "lessThan": "16.0.5404.1000", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Outlook 2013", "versions": [{"status": "affected", "version": "14.0.0", "lessThan": "15.0.5571.1000", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Outlook 2013 Service Pack 1", "versions": [{"status": "affected", "version": "15.0.0.0", "lessThan": "15.0.5571.1000", "versionType": "custom"}], "platforms": ["ARM64-based Systems"]}]}], "published": "2023-07-11T18:15:17.177", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311", "tags": ["Patch", "Vendor Advisory"], "source": "secure@microsoft.com"}, {"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311", "tags": ["Patch", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311", "tags": ["US Government Resource"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-367"}]}, {"type": "Secondary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-367"}]}], "descriptions": [{"lang": "en", "value": "Microsoft Outlook Security Feature Bypass Vulnerability"}], "lastModified": "2026-10-08T10:35:03.547", "cisaActionDue": "2023-08-01", "cisaExploitAdd": "2023-07-11", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "40C15EDD-98D4-4D06-BA06-21AE0F33C72D"}, {"criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "241CDE2B-ABD0-4EFF-8D73-1766E32FA20F"}, {"criteria": "cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*", "vulnerable": true, "matchCriteriaId": "14D63E3F-A431-4DD8-979F-811E8DAC423D"}, {"criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*", "vulnerable": true, "matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16"}, {"criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*", "vulnerable": true, "matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85"}, {"criteria": "cpe:2.3:a:microsoft:outlook:2013:-:-:*:-:-:*:*", "vulnerable": true, "matchCriteriaId": "77F369D5-6771-4141-A116-50FB275A937A"}, {"criteria": "cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:*", "vulnerable": true, "matchCriteriaId": "DDA98A76-D0D1-4BFA-BEAC-1C2313F7B859"}, {"criteria": "cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2B1657C-0FF4-461A-BE2A-641275C4B0A0"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com", "cisaRequiredAction": "Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.", "cisaVulnerabilityName": "Microsoft Outlook Security Feature Bypass Vulnerability"}