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Known exploited vulnerability

CVE-2023-23397

criticalCVSS 3.1 9.8In CISA KEVEPSS 97%Published · Microsoft

The short answer

CVE-2023-23397 affects Microsoft Microsoft Office LTSC 2021 and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-03-14: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Microsoft Outlook Elevation of Privilege Vulnerability

Weakness: CWE-20, CWE-294.

Severity

9.8 critical

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

Exploited (CISA KEV)

Yes, since Mar 14, 2023

Federal due date Apr 4, 2023

EPSS, next 30 days

97%

Higher than 100% of scored CVEs

How it can be exploited

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

What CISA says to do

Apply updates per vendor instructions.

Affected products

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

References

Questions

Is CVE-2023-23397 being exploited?

Yes. CISA added CVE-2023-23397 to its Known Exploited Vulnerabilities catalog on 2023-03-14, with a federal remediation due date of 2023-04-04.

How do I fix CVE-2023-23397?

CISA's required action: Apply updates per vendor instructions.

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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