CVE-2026-20449

CVE-2026-20449 is a medium-severity vulnerability in Mediatek Mt6763 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-120.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• EPSS exploit prediction: 0% (13th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2026-26889
• Weakness: CWE-120
• Affected product: Mediatek Mt6763 Firmware
• Published: 2026-05-04
• Last modified: 2026-06-17

Description

In Modem, there is a possible system crash due to a heap buffer overflow. 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: MOLY01760138; Issue ID: MSV-6148.

Frequently asked questions

What is CVE-2026-20449?

In Modem, there is a possible system crash due to a heap buffer overflow. 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: MOLY01760138; Issue ID: MSV-6148.

How severe is CVE-2026-20449?

CVE-2026-20449 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-2026-20449 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20449?

CVE-2026-20449 primarily affects Mediatek Mt6763 Firmware. In total, 68 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20449?

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

Does CVE-2026-20449 have an EU (EUVD) identifier?

Yes. CVE-2026-20449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26889.

When was CVE-2026-20449 published?

CVE-2026-20449 was published on 2026-05-04 and last updated on 2026-06-17.

References

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

Affected products (68)

• cpe:2.3:o:mediatek:mt6763_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6765_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6767_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6768_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6769_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6771_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6779_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6781_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6783_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6785_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6789_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6813_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6815_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6833_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6853_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6855_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6858_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6873_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6875_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6877_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6879_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6880_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6883_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6885_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6886_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6889_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6890_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6891_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6893_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6895_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6896_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6899_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6980_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6985_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6986d_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:mediatek:mt6988_firmware:-:*:*:*:*:*:*:*

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