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CVE-2023-35311

73
FAUCET Score

CVE-2023-35311 is a high-severity security feature bypass vulnerability affecting Microsoft Outlook, Microsoft 365 Apps, and Microsoft Office products. With a CVSS score of 8.8, it allows an unauthenticated attacker to achieve high impact on confidentiality, integrity, and availability with low attack complexity, though user interaction is required. This vulnerability is actively exploited in the wild, as confirmed by its presence in the KEV catalog. Despite active exploitation, no public exploit intelligence (Metasploit, Nuclei, ExploitDB) is currently available, though it has garnered significant community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
2021CPE matchmatch criteria
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:*:*
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:outlook:2013:-:-:*:-:-:*:*
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
15.52%
Probability of exploitation in next 30 days
EPSS Percentile
96.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jul 11, 2023
This CVE's current EPSS score of 0.1552 is in the 97th percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (12)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft 365 Apps for Enterprise for 32-bit SystemsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office LTSC 2021 for 32-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft 365 Apps for Enterprise for 64-bit SystemsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office LTSC 2021 for 64-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 32-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 64-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2016 (32-bit edition)Fixed in: 16.0.5404.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2016 (64-bit edition)Fixed in: 16.0.5404.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 (32-bit editions)Fixed in: 15.0.5571.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 (64-bit editions)Fixed in: 15.0.5571.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 RT Service Pack 1Fixed in: 15.0.5571.1000

Vendor Advisories (1)

microsoft2023-Jul/CVE-2023-35311Important

Microsoft Outlook Security Feature Bypass Vulnerability

Jul 11, 2023

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
msrc.microsoft.com / update-guide/vulnerability/CVE-2023-35311
PatchVendor Advisory