How severe is CVE-2024-21390?

CVE-2024-21390 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-21390 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21390?

CVE-2024-21390 affects Microsoft Authenticator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21390?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-21390 have an EU (EUVD) identifier?

Yes. CVE-2024-21390 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19101.

When was CVE-2024-21390 published?

CVE-2024-21390 was published on 2024-03-12 and last updated on 2026-06-17.

CVE-2024-21390

CVE-2024-21390 is a high-severity vulnerability in Microsoft Authenticator with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19101
Weakness: CWE-287
Affected product: Microsoft Authenticator
Published: 2024-03-12
Last modified: 2026-06-17

Description

Microsoft Authenticator Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2024-21390?: Microsoft Authenticator Elevation of Privilege Vulnerability
How severe is CVE-2024-21390?: CVE-2024-21390 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-21390 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21390?: CVE-2024-21390 affects Microsoft Authenticator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21390?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-21390 have an EU (EUVD) identifier?: Yes. CVE-2024-21390 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19101.
When was CVE-2024-21390 published?: CVE-2024-21390 was published on 2024-03-12 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21390

Affected products (1)

cpe:2.3:a:microsoft:authenticator:*:*:*:*:*:*:*:*

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