CVE-2026-20483 Vulnerability Analysis & Exploit Details

CVE-2026-20483
Vulnerability Scoring

7.7
/10
Very High Risk

Highly exploitable, CVE-2026-20483 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-20483 Details

Status: Analyzed

Last updated: 🕔 19 Aug 2026, 17:01 UTC
Originally published on: 🕒 03 Aug 2026, 03:16 UTC

Time between publication and last update: 16 days

CVSS Release: version 3

CVSS3 Source

134c704f-9b21-4f2e-91b3-4a467353bcc0

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVE-2026-20483 Vulnerability Summary

CVE-2026-20483: 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.

Assessing the Risk of CVE-2026-20483

Access Complexity Graph

The exploitability of CVE-2026-20483 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-20483

With low attack complexity and no required privileges, CVE-2026-20483 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-20483, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-20483, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-20483 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-20483 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2026-20483 does not impact system availability.

CVE-2026-20483 References

External References

CWE Common Weakness Enumeration

CWE-862

CAPEC Common Attack Pattern Enumeration and Classification

  • Exploitation of Thunderbolt Protection Flaws CAPEC-665 An adversary leverages a firmware weakness within the Thunderbolt protocol, on a computing device to manipulate Thunderbolt controller firmware in order to exploit vulnerabilities in the implementation of authorization and verification schemes within Thunderbolt protection mechanisms. Upon gaining physical access to a target device, the adversary conducts high-level firmware manipulation of the victim Thunderbolt controller SPI (Serial Peripheral Interface) flash, through the use of a SPI Programing device and an external Thunderbolt device, typically as the target device is booting up. If successful, this allows the adversary to modify memory, subvert authentication mechanisms, spoof identities and content, and extract data and memory from the target device. Currently 7 major vulnerabilities exist within Thunderbolt protocol with 9 attack vectors as noted in the Execution Flow.

Vulnerable Configurations

  • cpe:2.3:o:mediatek:mt8893_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8893_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8893:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8893:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6739_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6739_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6739:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6739:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6761_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6761_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6765_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6765_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6768_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6768_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6781_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6781_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6789_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6789_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6789:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6789:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6833_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6833_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6853_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6853_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6855_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6855_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6877_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6877_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6879_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6879_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6883_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6883_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6885_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6885_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6886_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6886_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6889_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6889_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6893_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6893_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6895_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6895_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6897:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6897:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6983:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6983:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6985_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6985_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6985:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6985:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6989_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6989_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt6993:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt6993:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8766_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8766_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8766:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8766:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8766r_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8766r_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8766r:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8766r:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8768_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8768_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8768:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8768:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8775:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8775:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8781_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8781_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8781:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8781:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8792:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8792:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8796_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8796_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8796:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8796:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8873_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8873_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8873:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8873:-:*:*:*:*:*:*:*
  • cpe:2.3:o:mediatek:mt8883_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:mediatek:mt8883_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:mediatek:mt8883:-:*:*:*:*:*:*:*
    cpe:2.3:h:mediatek:mt8883:-:*:*:*:*:*:*:*

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