CVE Intelligence
Medium

CVE-2026-20463 — In Modem, there is a possible escalation of privilege due to a permissions bypass. This…

In Modem, there is a possible escalation of privilege due to a permissions bypass. 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: MOLY01716533; Issue ID: MSV-6309.

Published Jul 1, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: MediaTek

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+1
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.16%
ahead of 5% of scored CVEs · Oct 15, 2026
Affects
Mediatek
MediaTek chipset
CVSS base
6.7
Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Mediatek MediaTek chipset).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Mediatek MediaTek chipset version MT6993version MT8766version MT8765version MT8755version MT8678version MT8676version MT8675version MT8673
and 75 more version MT8668version MT8667version MT8666version MT8766Rversion MT6991version MT6990version MT6989version MT6988version MT6986Dversion MT6986version MT6985version MT6983version MT6982version MT8791Tversion MT8893version MT8883version MT8873version MT8863version MT8798version MT8797version MT8796version MT8795Tversion MT8793version MT8792version MT6980version MT8791version MT8789version MT8788Eversion MT8788version MT8786version MT8781version MT8775version MT8771version MT8768version MT6769version MT6853version MT6835version MT6833version MT6813version MT6789version MT6785version MT6783version MT6781version MT6779version MT6771version MT6855version MT6768version MT6767version MT6765version MT6763version MT6762version MT6761version MT6739version MT2737version MT2735version MT6885version MT6899version MT6897version MT6896version MT6895version MT6893version MT6891version MT6890version MT6889version MT6886version MT2716version MT6883version MT6881version MT6880version MT6879version MT6878version MT6877version MT6875version MT6873version MT6858
Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.7 CVSS 3.1 Medium 0.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
6.7 CVSS 3.1 Medium — — CISA-ADP via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 134c704f-9b21-4f2e-91b3-4a467353bcc0)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-280

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · mediatek, inc./mediatek chipset
    Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 15, 2026
  • CVSS changed · 6.7
    Oct 15, 2026 · NIST National Vulnerability Database
  • Source status changed · → Deferred
    Oct 15, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 15, 2026 · NIST National Vulnerability Database
  • CVE published
    Jul 1, 2026 · MediaTek

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

Elsewhere on this site

Mediatek
every CVE for this vendor
CWE-280
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-20589 Out-of-bounds Write in Mediatek Mt2718 Firmware 11d
  • CVE-2026-20588 Out-of-bounds Write in Mediatek Mt2718 Firmware 11d
  • CVE-2026-20542 Use After Free in Mediatek Mt2718 Firmware 11d
  • CVE-2026-20587 Type Confusion in Mediatek Mt2718 Firmware 11d
  • CVE-2026-20543 In Modem, there is a possible information disclosure due to a logic error. This could… 11d
  • CVE-2026-20579 Out-of-bounds Write in Mediatek Mt2718 Firmware 11d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20463 is "In Modem, there is a possible escalation of privilege due to a permissions bypass. This…", rated Medium. It affects MediaTek chipset (Mediatek); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.7 describes technical severity. EPSS 0.16% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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