How severe is CVE-2021-39740?

CVE-2021-39740 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-39740 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-2021-39740?

CVE-2021-39740 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39740?

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

When was CVE-2021-39740 published?

CVE-2021-39740 was published on 2022-03-30 and last updated on 2026-06-17.

CVE-2021-39740

CVE-2021-39740 is a medium-severity vulnerability in Google Android with a CVSS 3.x base score of 5.5. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Google Android
Published: 2022-03-30
Last modified: 2026-06-17

Description

In Messaging, there is a possible way to bypass attachment restrictions due to improper input validation. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-209965112

Frequently asked questions

What is CVE-2021-39740?: In Messaging, there is a possible way to bypass attachment restrictions due to improper input validation. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-209965112
How severe is CVE-2021-39740?: CVE-2021-39740 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-39740 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-2021-39740?: CVE-2021-39740 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39740 published?: CVE-2021-39740 was published on 2022-03-30 and last updated on 2026-06-17.

References

https://source.android.com/security/bulletin/android-12l

Affected products (1)

cpe:2.3:o:google:android:12.1:*:*:*:*:*:*:*

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