How severe is CVE-2026-20456?

CVE-2026-20456 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 none, integrity none, and availability high.

Is CVE-2026-20456 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-2026-20456?

CVE-2026-20456 primarily affects Mediatek Mt7902 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20456?

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

Does CVE-2026-20456 have an EU (EUVD) identifier?

Yes. CVE-2026-20456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33545.

When was CVE-2026-20456 published?

CVE-2026-20456 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-20456

CVE-2026-20456 is a medium-severity vulnerability in Mediatek Mt7902 Firmware 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33545
Weakness: CWE-787
Affected product: Mediatek Mt7902 Firmware
Published: 2026-06-01
Last modified: 2026-06-17

Description

In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.

Frequently asked questions

What is CVE-2026-20456?: In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
How severe is CVE-2026-20456?: CVE-2026-20456 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 none, integrity none, and availability high.
Is CVE-2026-20456 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-2026-20456?: CVE-2026-20456 primarily affects Mediatek Mt7902 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20456 have an EU (EUVD) identifier?: Yes. CVE-2026-20456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33545.
When was CVE-2026-20456 published?: CVE-2026-20456 was published on 2026-06-01 and last updated on 2026-06-17.

References

https://corp.mediatek.com/product-security-bulletin/June-2026

Affected products (6)

cpe:2.3:o:mediatek:mt7902_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7920_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7921_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7922_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7925_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7927_firmware:-:*:*:*:*:*:*:*

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