How severe is CVE-2026-20493?

CVE-2026-20493 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20493 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-2026-20493?

CVE-2026-20493 primarily affects Mediatek Mt6890 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20493?

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

When was CVE-2026-20493 published?

CVE-2026-20493 was published on 2026-08-03 and last updated on 2026-08-19.

CVE-2026-20493

CVE-2026-20493 is a medium-severity vulnerability in Mediatek Mt6890 Firmware with a CVSS 3.x base score of 4.4. 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 4.4)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Mediatek Mt6890 Firmware
Published: 2026-08-03
Last modified: 2026-08-19

Description

In wifi, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: BORA00154903; Issue ID: MSV-7575.

Frequently asked questions

What is CVE-2026-20493?: In wifi, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: BORA00154903; Issue ID: MSV-7575.
How severe is CVE-2026-20493?: CVE-2026-20493 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-20493 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-2026-20493?: CVE-2026-20493 primarily affects Mediatek Mt6890 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20493?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-20493 published?: CVE-2026-20493 was published on 2026-08-03 and last updated on 2026-08-19.

References

https://www.mediatek.com/product-security-bulletin/August-2026

Affected products (3)

cpe:2.3:o:mediatek:mt6890_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6988_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6990_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Mediatek Mt6890 Firmware

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CVE-2026-20432 — High (CVSS 8.0): In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation…
CVE-2026-20479 — High (CVSS 7.5): In Modem, there is a possible out of bounds read due to a missing bounds check. This could lead to remote denial of…
CVE-2026-20450 — Medium (CVSS 6.5): In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of…
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