Security readout for executives and security teams
Plain-English summary
CVE-2026-20413 is a MediaTek imgsys vulnerability affecting specific chipsets. It could let an attacker who already has System-level privileges gain further local privileges. This is not a remote entry point and does not require user interaction. Business urgency is moderate, focused on devices using the listed MediaTek chipsets.
Executive priority
Treat as a targeted firmware exposure rather than an internet-scale emergency. Prioritize confirmation of affected MediaTek-based devices and OEM patch availability, especially for managed mobile, embedded, or IoT fleets where firmware updates are slower.
Technical view
The issue is an out-of-bounds write in imgsys caused by a missing bounds check. MediaTek reports potential local escalation of privilege, requiring prior System privilege. CVSS is 6.7 with AV:L/AC:L/PR:H/UI:N and high confidentiality, integrity, and availability impact. Patch ID is ALPS10362725; Issue ID is MSV-5694.
Likely exposure
Exposure is limited to products using MediaTek chipsets MT6899, MT6991, MT8678, or MT8793. The CVE data lists default status as unaffected outside named affected versions. Organizations should map device fleets and OEM firmware dependencies to these chipsets.
Exploitation context
Sources do not report active exploitation, and the CVE is not marked in KEV. Exploitation is local, requires low attack complexity, no user interaction, but requires the attacker to already have System privilege. This makes it most relevant to chained attacks or post-compromise privilege expansion.
Researcher notes
The public record provides limited implementation detail. It identifies imgsys, an out-of-bounds write, CWE-1285, affected chipset identifiers, and MediaTek patch metadata. No exploit details, proof of concept, or active exploitation evidence are provided in the supplied sources.
Mitigation direction
- Check MediaTek February 2026 bulletin and OEM advisories for firmware updates containing ALPS10362725.
- Prioritize updates for devices confirmed to use MT6899, MT6991, MT8678, or MT8793.
- If updates are unavailable, request remediation timelines from device OEMs or managed service providers.
- Maintain least privilege and endpoint controls to reduce chances of initial System-level compromise.
Validation and detection
- Inventory devices and identify MediaTek chipset models through asset records or OEM documentation.
- Confirm whether firmware builds include MediaTek patch ID ALPS10362725.
- Review OEM security bulletins for corresponding device-specific update availability.
- Monitor CISA KEV and vendor bulletins for any change in exploitation status.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1285: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20413 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.7MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://corp.mediatek.com/product-security-bulletin/February-2026CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Validation of Specified Index, Position, or Offset in Input
Improper Validation of Specified Index, Position, or Offset in Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.