CVE-2026-20456

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.

Published: 2026-06-01 Last update: 2026-06-01 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20456 is rated Low Risk (22.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20456

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.10% +0.08%
2 2026-06-01 — 0.02% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20456

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-20456

GitHub Security Advisory for CVE-2026-20456

GHSA-v8qh-hh5q-9vc3 · Severity: medium — In wlan STA driver, there is a possible system crash due to a missing bounds check. This could...

Affected software / configurations for CVE-2026-20456

Vendor Product Version Raw CPE
mediatek mt7902_firmware — cpe:2.3:o:mediatek:mt7902_firmware:-:*:*:*:*:*:*:*
mediatek mt7920_firmware — cpe:2.3:o:mediatek:mt7920_firmware:-:*:*:*:*:*:*:*
mediatek mt7921_firmware — cpe:2.3:o:mediatek:mt7921_firmware:-:*:*:*:*:*:*:*
mediatek mt7922_firmware — cpe:2.3:o:mediatek:mt7922_firmware:-:*:*:*:*:*:*:*
mediatek mt7925_firmware — cpe:2.3:o:mediatek:mt7925_firmware:-:*:*:*:*:*:*:*
mediatek mt7927_firmware — cpe:2.3:o:mediatek:mt7927_firmware:-:*:*:*:*:*:*:*

References for CVE-2026-20456

cvelogic Threat Intelligence