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Known exploited vulnerability

CVE-2024-21410

criticalCVSS 3.1 9.8In CISA KEVEPSS 13%Published · Microsoft

The short answer

CVE-2024-21410 affects Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2024-02-15: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Microsoft Exchange Server Elevation of Privilege Vulnerability

Weakness: CWE-287.

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 Feb 15, 2024

Federal due date Mar 7, 2024

EPSS, next 30 days

13%

Higher than 96% 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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected products

Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 13, Microsoft Exchange Server 2019 Cumulative Update 14. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2024-21410 being exploited?

Yes. CISA added CVE-2024-21410 to its Known Exploited Vulnerabilities catalog on 2024-02-15, with a federal remediation due date of 2024-03-07.

How do I fix CVE-2024-21410?

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations 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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