CVE-2026-20483

HIGH
7.7
CVSS Score
Published: August 3, 2026 at 02:05 AM UTC
Updated: October 23, 2026 at 10:10 PM UTC
36 products affected across 2 vendorsMT6991 FirmwareMT6993 FirmwareMT8781 Firmware· also runs on 35 platforms

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Severity
HIGH7.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In Telephony, there is a possible escalation of privilege due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11087526; Issue ID: MSV-8243.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
mediatek-mt6739 (same device)
All versions
mediatek-mt6761 (same device)
All versions
mediatek-mt6765 (same device)
All versions
mediatek-mt6768 (same device)
All versions
mediatek-mt6781 (same device)
All versions
mediatek-mt6789 (same device)
All versions
mediatek-mt6833 (same device)
All versions
mediatek-mt6835 (same device)
All versions
mediatek-mt6853 (same device)
All versions
mediatek-mt6855 (same device)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-862

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