How severe is CVE-2026-20452?

CVE-2026-20452 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-20452 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20452?

CVE-2026-20452 primarily affects Mediatek Mt6890 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20452?

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-2026-20452 have an EU (EUVD) identifier?

Yes. CVE-2026-20452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33541.

When was CVE-2026-20452 published?

CVE-2026-20452 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-20452

CVE-2026-20452 is a high-severity vulnerability in Mediatek Mt6890 Firmware with a CVSS 3.x base score of 8.0. 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-122.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33541
Weakness: CWE-122
Affected product: Mediatek Mt6890 Firmware
Published: 2026-06-01
Last modified: 2026-06-17

Description

In wlan AP driver, there is a possible memory corruption due to a heap buffer overflow. This could lead to remote (proximal/adjacent) code execution with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480138; Issue ID: MSV-6295.

Frequently asked questions

What is CVE-2026-20452?: In wlan AP driver, there is a possible memory corruption due to a heap buffer overflow. This could lead to remote (proximal/adjacent) code execution with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480138; Issue ID: MSV-6295.
How severe is CVE-2026-20452?: CVE-2026-20452 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20452 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20452?: CVE-2026-20452 primarily affects Mediatek Mt6890 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20452?: 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-2026-20452 have an EU (EUVD) identifier?: Yes. CVE-2026-20452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33541.
When was CVE-2026-20452 published?: CVE-2026-20452 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 (9)

cpe:2.3:o:mediatek:mt6890_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7615_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7915_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7916_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7981_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7986_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7990_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7992_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt7993_firmware:-:*:*:*:*:*:*:*

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