CVE-2026-20456: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20456) affects several MediaTek chipset models through an out-of-bounds write in the wlan STA driver due to a missing bounds check. The flaw can cause a system crash, leading to denial of service. Exploitation requires local user privileges but does not require user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with an attack vector of local access, low attack complexity, and no confidentiality or integrity impact, only availability impact. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
Successful exploitation causes a local denial of service by crashing the system. There is no impact on confidentiality or integrity. The attacker needs local user privileges but does not require user interaction to trigger the vulnerability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released by MediaTek, users should limit local access to trusted users and monitor for updates from the vendor regarding this issue.
CVE-2026-20456: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
Description
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20456) affects several MediaTek chipset models through an out-of-bounds write in the wlan STA driver due to a missing bounds check. The flaw can cause a system crash, leading to denial of service. Exploitation requires local user privileges but does not require user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with an attack vector of local access, low attack complexity, and no confidentiality or integrity impact, only availability impact. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
Successful exploitation causes a local denial of service by crashing the system. There is no impact on confidentiality or integrity. The attacker needs local user privileges but does not require user interaction to trigger the vulnerability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released by MediaTek, users should limit local access to trusted users and monitor for updates from the vendor regarding this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.014Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1d8336e29bf47b50f6ae51
Added to database: 06/01/2026, 13:03:50 UTC
Last enriched: 06/01/2026, 13:19:11 UTC
Last updated: 07/25/2026, 08:52:02 UTC
Views: 93
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.