How severe is CVE-2025-20721?

CVE-2025-20721 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-20721 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-2025-20721?

CVE-2025-20721 primarily affects Mediatek Iot Yocto. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20721?

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-2025-20721 have an EU (EUVD) identifier?

Yes. CVE-2025-20721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34171.

When was CVE-2025-20721 published?

CVE-2025-20721 was published on 2025-10-14 and last updated on 2026-06-17.

CVE-2025-20721

CVE-2025-20721 is a high-severity vulnerability in Mediatek Iot Yocto with a CVSS 3.x base score of 7.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-34171
Weakness: CWE-787
Affected product: Mediatek Iot Yocto
Published: 2025-10-14
Last modified: 2026-06-17

Description

In imgsensor, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10089545; Issue ID: MSV-4279.

Frequently asked questions

What is CVE-2025-20721?: In imgsensor, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10089545; Issue ID: MSV-4279.
How severe is CVE-2025-20721?: CVE-2025-20721 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-20721 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-2025-20721?: CVE-2025-20721 primarily affects Mediatek Iot Yocto. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20721?: 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-2025-20721 have an EU (EUVD) identifier?: Yes. CVE-2025-20721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34171.
When was CVE-2025-20721 published?: CVE-2025-20721 was published on 2025-10-14 and last updated on 2026-06-17.

References

https://corp.mediatek.com/product-security-bulletin/October-2025

Affected products (5)

cpe:2.3:a:mediatek:iot_yocto:25.0:*:*:*:*:*:*:*
cpe:2.3:o:google:android:13.0:*:*:*:*:*:*:*
cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:*
cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*
cpe:2.3:o:google:android:16.0:*:*:*:*:*:*:*

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