How severe is CVE-2026-20431?

CVE-2026-20431 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20431?

CVE-2026-20431 primarily affects Mediatek Mt6813 Firmware. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20431?

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

Does CVE-2026-20431 have an EU (EUVD) identifier?

Yes. CVE-2026-20431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19564.

When was CVE-2026-20431 published?

CVE-2026-20431 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-20431

CVE-2026-20431 is a medium-severity vulnerability in Mediatek Mt6813 Firmware with a CVSS 3.x base score of 6.5. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19564
Weakness: CWE-770
Affected product: Mediatek Mt6813 Firmware
Published: 2026-04-07
Last modified: 2026-06-17

Description

In Modem, there is a possible system crash due to a logic error. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01106496; Issue ID: MSV-4467.

Frequently asked questions

What is CVE-2026-20431?: In Modem, there is a possible system crash due to a logic error. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01106496; Issue ID: MSV-4467.
How severe is CVE-2026-20431?: CVE-2026-20431 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-20431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20431?: CVE-2026-20431 primarily affects Mediatek Mt6813 Firmware. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20431 have an EU (EUVD) identifier?: Yes. CVE-2026-20431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19564.
When was CVE-2026-20431 published?: CVE-2026-20431 was published on 2026-04-07 and last updated on 2026-06-17.

References

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

Affected products (19)

cpe:2.3:o:mediatek:mt6813_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6815_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6899_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6986_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8668_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8676_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8678_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8755_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8793_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8863_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8873_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8883_firmware:-:*:*:*:*:*:*:*

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