How severe is CVE-2023-21387?

CVE-2023-21387 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-21387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21387?

CVE-2023-21387 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-21387?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-21387 published?

CVE-2023-21387 was published on 2023-10-30 and last updated on 2026-06-17.

CVE-2023-21387

CVE-2023-21387 is a medium-severity vulnerability in Google Android with a CVSS 3.x base score of 4.4. 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-532.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-532
Affected product: Google Android
Published: 2023-10-30
Last modified: 2026-06-17

Description

In User Backup Manager, there is a possible way to leak a token to bypass user confirmation for backup due to log information disclosure. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.

Frequently asked questions

What is CVE-2023-21387?: In User Backup Manager, there is a possible way to leak a token to bypass user confirmation for backup due to log information disclosure. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
How severe is CVE-2023-21387?: CVE-2023-21387 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-21387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21387?: CVE-2023-21387 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-21387?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-21387 published?: CVE-2023-21387 was published on 2023-10-30 and last updated on 2026-06-17.

References

https://source.android.com/docs/security/bulletin/android-14

Affected products (1)

cpe:2.3:o:google:android:*:*:*:*:*:*:*:*

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