How severe is CVE-2025-20709?

CVE-2025-20709 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-20709 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20709?

CVE-2025-20709 primarily affects Mediatek Software Development Kit. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20709?

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-2025-20709 have an EU (EUVD) identifier?

Yes. CVE-2025-20709 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34175.

When was CVE-2025-20709 published?

CVE-2025-20709 was published on 2025-10-14 and last updated on 2026-06-17.

CVE-2025-20709

CVE-2025-20709 is a high-severity vulnerability in Mediatek Software Development Kit with a CVSS 3.x base score of 8.8. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-34175
Weakness: CWE-120
Affected product: Mediatek Software Development Kit
Published: 2025-10-14
Last modified: 2026-06-17

Description

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00415809; Issue ID: MSV-3405.

Frequently asked questions

What is CVE-2025-20709?: In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00415809; Issue ID: MSV-3405.
How severe is CVE-2025-20709?: CVE-2025-20709 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-20709 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20709?: CVE-2025-20709 primarily affects Mediatek Software Development Kit. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20709?: 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-2025-20709 have an EU (EUVD) identifier?: Yes. CVE-2025-20709 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34175.
When was CVE-2025-20709 published?: CVE-2025-20709 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 (3)

cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*
cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*
cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*

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