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Known exploited vulnerability

CVE-2023-35311

highCVSS 3.1 8.8In CISA KEVEPSS 16%Published · Microsoft

The short answer

CVE-2023-35311 affects Microsoft Microsoft 365 Apps for Enterprise and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-07-11: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Microsoft Outlook Security Feature Bypass Vulnerability

Weakness: CWE-367.

Severity

8.8 high

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

Exploited (CISA KEV)

Yes, since Jul 11, 2023

Federal due date Aug 1, 2023

EPSS, next 30 days

16%

Higher than 97% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

Affected products

Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office 2019, Microsoft Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2013 Service Pack 1. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-35311 being exploited?

Yes. CISA added CVE-2023-35311 to its Known Exploited Vulnerabilities catalog on 2023-07-11, with a federal remediation due date of 2023-08-01.

How do I fix CVE-2023-35311?

CISA's required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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