MediaTek chipset: Improper Validation of Specified Index, Position, or Offset in Input
CVE-2026-20524 is a high-severity improper validation of specified index, position, or offset in input vulnerability in MediaTek chipset from MediaTek, with a CVSS 3.1 base score of 8.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. Affected MediaTek chipset versions: MT6899; MT6993; MT8668, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of MediaTek chipset you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on mediatek.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| MediaTek | MediaTek chipset | MT6899; MT6993; MT8668; MT8781; MT8793; MT8910 | Not stated |
| MediaTek | Mt6899 Firmware | Not specified in the record | Not stated |
| MediaTek | Mt6993 Firmware | Not specified in the record | Not stated |
| MediaTek | Mt8668 Firmware | Not specified in the record | Not stated |
| MediaTek | Mt8781 Firmware | Not specified in the record | Not stated |
| MediaTek | Mt8793 Firmware | Not specified in the record | Not stated |
| MediaTek | Mt8910 Firmware | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
In apu, there is a possible memory corruption due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11249004; Issue ID: MSV-9170.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Validation of Specified Index, Position, or Offset in Input
The product receives input that is expected to specify an index, position, or offset into an indexable resource such as a buffer or file, but it does not validate or incorrectly validates that the specified index/position/offset has the required properties.
More Improper Validation of Specified Index, Position, or Offset in Input vulnerabilities (CWE-1285)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in MediaTek chipset
- 8.4 High severity
- 7.5 High severity
- 8.4 High severity
Recent Improper Validation of Specified Index, Position, or Offset in Input vulnerabilities
- 7.8 High severity
- 8.9 High severity
- 7.8 High severity
- 7.1 High severity
- 8.6 High severity
- 7.8 High severity
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