How severe is CVE-2021-0543?

CVE-2021-0543 has a CVSS 3.x base score of 6.7, 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 high, and availability high.

Is CVE-2021-0543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-0543?

CVE-2021-0543 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-0543?

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

When was CVE-2021-0543 published?

CVE-2021-0543 was published on 2021-06-22 and last updated on 2026-06-17.

CVE-2021-0543

CVE-2021-0543 is a medium-severity vulnerability in Google Android with a CVSS 3.x base score of 6.7. 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-190.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
CVSS v2: 4.6
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Google Android
Published: 2021-06-22
Last modified: 2026-06-17

Description

In phNxpNciHal_process_ext_rsp of phNxpNciHal_ext.cc, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-169258743

Frequently asked questions

What is CVE-2021-0543?: In phNxpNciHal_process_ext_rsp of phNxpNciHal_ext.cc, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-169258743
How severe is CVE-2021-0543?: CVE-2021-0543 has a CVSS 3.x base score of 6.7, 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 high, and availability high.
Is CVE-2021-0543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-0543?: CVE-2021-0543 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-0543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-0543 published?: CVE-2021-0543 was published on 2021-06-22 and last updated on 2026-06-17.

References

https://source.android.com/security/bulletin/pixel/2021-06-01

Affected products (1)

cpe:2.3:o:google:android:11.0:*:*:*:*:*:*:*

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