CVE-2026-20455
CVE-2026-20455 is a high-severity vulnerability in Mediatek Mt6739 Firmware with a CVSS 3.x base score of 7.8. 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: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 0% (1st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-33544
- Weakness: CWE-787
- Affected product: Mediatek Mt6739 Firmware
- Published:
- Last modified:
Description
In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10873936; Issue ID: MSV-6784.
Frequently asked questions
- What is CVE-2026-20455?
- In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10873936; Issue ID: MSV-6784.
- How severe is CVE-2026-20455?
- CVE-2026-20455 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-20455 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-2026-20455?
- CVE-2026-20455 primarily affects Mediatek Mt6739 Firmware. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-20455?
- 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-2026-20455 have an EU (EUVD) identifier?
- Yes. CVE-2026-20455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33544.
- When was CVE-2026-20455 published?
- CVE-2026-20455 was published on 2026-06-01 and last updated on 2026-06-17.
References
Affected products (36)
- cpe:2.3:o:mediatek:mt6739_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6761_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6765_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6768_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6781_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6789_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:mt6877_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6879_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:mt6893_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6895_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6899_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6985_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6989_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8673_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8765_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8766_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8768_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8781_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8786_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8788_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8791t_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8793_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8797_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8798_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:mediatek:mt8910_firmware:-:*:*:*:*:*:*:*
More vulnerabilities in Mediatek Mt6739 Firmware
- CVE-2026-20453 — Medium (CVSS 6.7): In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local…
- CVE-2026-20449 — Medium (CVSS 6.5): In Modem, there is a possible system crash due to a heap buffer overflow. This could lead to remote denial of service,…
- CVE-2025-20659 — Medium (CVSS 6.5): In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of…
- CVE-2026-20454 — Medium (CVSS 6.4): In geniezone, there is a possible out of bounds write due to a race condition. This could lead to local escalation of…
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